首页 > 最新文献

24th Australasian Finance & Banking Conference 2011 (Archive)最新文献

英文 中文
The Role of Blockholders in the Corporate Debt Maturity Structure 大股东在公司债务期限结构中的作用
Pub Date : 2019-08-07 DOI: 10.2139/ssrn.1912284
Zheyao Pan, Kelvin Jui Keng Tan
This paper examines the impact of blockholders on the corporate debt maturity structure within the framework of agency theory. Using a novel and hand-collected dataset in Australia, we find support for our hypothesis that debt maturity is a concave function of block equity ownership. Our findings contribute to empirical evidence on the monitoring effects of blockholders and the use of debt maturity to control for debt-equity and manager-equity conflicts.
本文在代理理论的框架下考察了大股东对公司债务期限结构的影响。在澳大利亚使用一个新颖的手工收集的数据集,我们发现支持我们的假设,即债务期限是块股权所有权的凹函数。我们的研究结果为大股东的监测效果以及使用债务期限来控制债务-股权和管理者-股权冲突提供了经验证据。
{"title":"The Role of Blockholders in the Corporate Debt Maturity Structure","authors":"Zheyao Pan, Kelvin Jui Keng Tan","doi":"10.2139/ssrn.1912284","DOIUrl":"https://doi.org/10.2139/ssrn.1912284","url":null,"abstract":"This paper examines the impact of blockholders on the corporate debt maturity structure within the framework of agency theory. Using a novel and hand-collected dataset in Australia, we find support for our hypothesis that debt maturity is a concave function of block equity ownership. Our findings contribute to empirical evidence on the monitoring effects of blockholders and the use of debt maturity to control for debt-equity and manager-equity conflicts.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129451030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Asset Pricing Implications of Demographic Change 人口变化对资产定价的影响
Pub Date : 2017-01-19 DOI: 10.2139/SSRN.1836483
T. Maurer
An overlapping generations model featuring stochastic birth and death rates is solved in general equilibrium. I provide sufficient conditions for the interest rate to be decreasing in the birth rate and increasing in the death rate. If preferences are recursive, demographic uncertainty is priced in financial markets, and the equity premium is higher during periods characterized by a high birth rate and low mortality than in times of a low birth and high death rate. Demographic changes explain substantial parts of the time variation in the real interest rate, equity premium and conditional stock price volatility.
在一般均衡条件下求解了一个具有随机出生率和死亡率的世代重叠模型。我提供了利率在出生率中下降而在死亡率中上升的充分条件。如果偏好是递归的,人口的不确定性就反映在金融市场上,在出生率高、死亡率低的时期,股票溢价高于出生率低、死亡率高的时期。人口结构的变化在很大程度上解释了实际利率、股票溢价和有条件股价波动的时间变化。
{"title":"Asset Pricing Implications of Demographic Change","authors":"T. Maurer","doi":"10.2139/SSRN.1836483","DOIUrl":"https://doi.org/10.2139/SSRN.1836483","url":null,"abstract":"An overlapping generations model featuring stochastic birth and death rates is solved in general equilibrium. I provide sufficient conditions for the interest rate to be decreasing in the birth rate and increasing in the death rate. If preferences are recursive, demographic uncertainty is priced in financial markets, and the equity premium is higher during periods characterized by a high birth rate and low mortality than in times of a low birth and high death rate. Demographic changes explain substantial parts of the time variation in the real interest rate, equity premium and conditional stock price volatility.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124411753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Do Return Prediction Models Add Economic Value? 收益预测模型能增加经济价值吗?
Pub Date : 2012-06-06 DOI: 10.2139/ssrn.1913736
Tolga Cenesizoglu, A. Timmermann
We compare statistical and economic measures of forecasting performance across a large set of stock return prediction models with time-varying mean and volatility. We find that it is very common for models to produce higher out-of-sample mean squared forecast errors than a model assuming a constant equity premium, yet simultaneously add economic value when their forecasts are used to guide portfolio decisions. While there is generally a positive correlation between a return prediction model’s out-of-sample statistical performance and its ability to add economic value, the relation tends to be weak and only explains a small part of the cross-sectional variation in different models’ economic value.
我们比较了一组具有时变均值和波动率的股票收益预测模型的统计和经济指标。我们发现,与假设股票溢价不变的模型相比,模型产生更高的样本外均方预测误差是很常见的,然而,当它们的预测用于指导投资组合决策时,同时增加了经济价值。虽然收益预测模型的样本外统计性能与其经济价值增加能力之间普遍存在正相关关系,但这种关系往往较弱,只能解释不同模型经济价值的一小部分横截面变化。
{"title":"Do Return Prediction Models Add Economic Value?","authors":"Tolga Cenesizoglu, A. Timmermann","doi":"10.2139/ssrn.1913736","DOIUrl":"https://doi.org/10.2139/ssrn.1913736","url":null,"abstract":"We compare statistical and economic measures of forecasting performance across a large set of stock return prediction models with time-varying mean and volatility. We find that it is very common for models to produce higher out-of-sample mean squared forecast errors than a model assuming a constant equity premium, yet simultaneously add economic value when their forecasts are used to guide portfolio decisions. While there is generally a positive correlation between a return prediction model’s out-of-sample statistical performance and its ability to add economic value, the relation tends to be weak and only explains a small part of the cross-sectional variation in different models’ economic value.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130003646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Long-Term U.S. Infrastructure Returns and Portfolio Selection 美国基础设施的长期回报和投资组合选择
Pub Date : 2011-10-25 DOI: 10.2139/ssrn.1914055
Michael Francis Howard, R. Bianchi, G. Bornholt, M. Drew
Our understanding of the long-term return behavior and portfolio characteristics of public infrastructure investments is limited by a relatively short history of empirical data. We re-construct U.S. listed infrastructure index returns by mapping their monthly performance to received systematic and industry risk factors from 1927 through 2010. Our findings reveal that the infrastructure returns in recent years may understate the tail-risk that investors could experience over the long-term, however, this tail-risk is commensurate with holding a broad portfolio of U.S. stocks. For mean-variance and mean-CVaR investors, we report the benefits of holding public infrastructure assets in investment portfolios.
我们对公共基础设施投资的长期回报行为和投资组合特征的理解受到相对较短的经验数据历史的限制。从1927年到2010年,我们通过将美国上市基础设施指数的月度表现与收到的系统和行业风险因素进行映射,重建了它们的回报。我们的研究结果表明,近年来的基础设施回报可能低估了投资者长期可能经历的尾部风险,然而,这种尾部风险与持有广泛的美国股票投资组合相称。对于均值方差和均值cvar投资者,我们报告了在投资组合中持有公共基础设施资产的收益。
{"title":"Long-Term U.S. Infrastructure Returns and Portfolio Selection","authors":"Michael Francis Howard, R. Bianchi, G. Bornholt, M. Drew","doi":"10.2139/ssrn.1914055","DOIUrl":"https://doi.org/10.2139/ssrn.1914055","url":null,"abstract":"Our understanding of the long-term return behavior and portfolio characteristics of public infrastructure investments is limited by a relatively short history of empirical data. We re-construct U.S. listed infrastructure index returns by mapping their monthly performance to received systematic and industry risk factors from 1927 through 2010. Our findings reveal that the infrastructure returns in recent years may understate the tail-risk that investors could experience over the long-term, however, this tail-risk is commensurate with holding a broad portfolio of U.S. stocks. For mean-variance and mean-CVaR investors, we report the benefits of holding public infrastructure assets in investment portfolios.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116239641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
A Comparative Technical, Cost and Profit Efficiency Analysis of Australian, Canadian and UK Banks: Feasible Efficiency Improvements in the Context of Controllable and Uncontrollable Factors 澳大利亚、加拿大和英国银行技术效率、成本效率和利润效率的比较分析:可控和不可控因素背景下可行的效率提升
Pub Date : 2011-08-21 DOI: 10.2139/ssrn.1914094
D. Xiang, Abul Shamsuddin, A. Worthington
This paper employs a mixed two-stage approach to estimate and explain differences in the cross-country efficiency of ten Australian, five UK and eight Canadian banks over the period 1988 to 2008 using stochastic distance, cost and profit frontiers. The variables specified in the stochastic frontiers used to estimate efficiency include the amount and prices of labour, physical capital and deposits, along with the level of non-interest income, profits and total costs. The country and firm-specific variables specified as explanatory factors include per capita national income, capital adequacy, deposit density, the industry concentration ratio, the level of intangible assets, and ratios of provisions for loan losses-to-total loans, loans-to-deposits, debt-to-equity, loans-to-total assets and long-term debt-to-total capital, among many others. In line with the experience of the banking sector during the recent global finance crisis, the evidence indicates that Australian banks exhibit superior efficiency compared with their Canadian and UK counterparts. Key factors found to affect efficiency positively include the level of intangible assets and the loans-to-deposits and loans-to-assets ratios. In contrast, key factors found to affect efficiency negatively include bank size and the ratios of loan loss provisions-to-total loans and the debt-to-equity ratio.
本文采用混合两阶段方法来估计和解释1988年至2008年期间10家澳大利亚、5家英国和8家加拿大银行的跨国效率差异,使用随机距离、成本和利润边界。用于估计效率的随机边界中指定的变量包括劳动力、实物资本和存款的数量和价格,以及非利息收入、利润和总成本的水平。指定为解释因素的国家和公司特定变量包括人均国民收入、资本充足率、存款密度、行业集中度、无形资产水平、贷款损失拨备与总贷款、贷款与存款、债务与权益、贷款与总资产和长期债务与总资本的比率等等。根据最近全球金融危机期间银行业的经验,有证据表明,与加拿大和英国的同行相比,澳大利亚的银行表现出更高的效率。发现对效率有积极影响的关键因素包括无形资产水平、存贷比和贷资产比。相比之下,发现对效率产生负面影响的关键因素包括银行规模和贷款损失准备金与总贷款的比率以及债务权益比率。
{"title":"A Comparative Technical, Cost and Profit Efficiency Analysis of Australian, Canadian and UK Banks: Feasible Efficiency Improvements in the Context of Controllable and Uncontrollable Factors","authors":"D. Xiang, Abul Shamsuddin, A. Worthington","doi":"10.2139/ssrn.1914094","DOIUrl":"https://doi.org/10.2139/ssrn.1914094","url":null,"abstract":"This paper employs a mixed two-stage approach to estimate and explain differences in the cross-country efficiency of ten Australian, five UK and eight Canadian banks over the period 1988 to 2008 using stochastic distance, cost and profit frontiers. The variables specified in the stochastic frontiers used to estimate efficiency include the amount and prices of labour, physical capital and deposits, along with the level of non-interest income, profits and total costs. The country and firm-specific variables specified as explanatory factors include per capita national income, capital adequacy, deposit density, the industry concentration ratio, the level of intangible assets, and ratios of provisions for loan losses-to-total loans, loans-to-deposits, debt-to-equity, loans-to-total assets and long-term debt-to-total capital, among many others. In line with the experience of the banking sector during the recent global finance crisis, the evidence indicates that Australian banks exhibit superior efficiency compared with their Canadian and UK counterparts. Key factors found to affect efficiency positively include the level of intangible assets and the loans-to-deposits and loans-to-assets ratios. In contrast, key factors found to affect efficiency negatively include bank size and the ratios of loan loss provisions-to-total loans and the debt-to-equity ratio.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116660381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Natural Disasters - Blessings in Disguise? 自然灾害-伪装的祝福?
Pub Date : 2011-08-21 DOI: 10.2139/ssrn.1913664
Hardjo Koerniadi, C. Krishnamurti, A. Tourani-Rad
This study examines the impact of natural disasters on market returns and on several industries that are likely to be affected by the disasters. We find that different natural disasters have different impacts on the returns of the market and on those of industries. Our evidence suggests that while earthquake, hurricane and tornado could negatively affect market returns several weeks after the events, other disasters such as flood, tsunami and volcanic eruption may have limited impact on market returns. We also find that construction and materials industry is positively affected by natural disasters but nonlife and travel industries are likely to suffer when a natural disaster strikes.
本研究探讨自然灾害对市场回报的影响,以及对可能受灾害影响的几个行业的影响。我们发现,不同的自然灾害对市场收益和行业收益的影响是不同的。我们的证据表明,虽然地震、飓风和龙卷风会在事件发生几周后对市场回报产生负面影响,但洪水、海啸和火山爆发等其他灾害对市场回报的影响可能有限。自然灾害对建筑业和材料业的影响显著,对非寿险和旅游业的影响较大。
{"title":"Natural Disasters - Blessings in Disguise?","authors":"Hardjo Koerniadi, C. Krishnamurti, A. Tourani-Rad","doi":"10.2139/ssrn.1913664","DOIUrl":"https://doi.org/10.2139/ssrn.1913664","url":null,"abstract":"This study examines the impact of natural disasters on market returns and on several industries that are likely to be affected by the disasters. We find that different natural disasters have different impacts on the returns of the market and on those of industries. Our evidence suggests that while earthquake, hurricane and tornado could negatively affect market returns several weeks after the events, other disasters such as flood, tsunami and volcanic eruption may have limited impact on market returns. We also find that construction and materials industry is positively affected by natural disasters but nonlife and travel industries are likely to suffer when a natural disaster strikes.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124404959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Macro Drivers of Australian Housing Affordability, 1985–2010: An Autoregressive Distributed Lag Approach 澳大利亚住房负担能力的宏观驱动因素,1985-2010:自回归分布滞后方法
Pub Date : 2011-08-21 DOI: 10.2139/ssrn.1913972
A. Worthington, H. Higgs
This paper models the macro drivers of Australian housing affordability using aggregate quarterly data over the period September 1985 to June 2010 and an autoregressive distributed lag (ARDL) approach. We employ two alternative measures of relative housing affordability: the Housing Industry Association’s Housing Affordability Index and the housing price-earnings multiplier. Six sets of variables are then used to proxy the economic, demographic, financial, social and other factors that influence housing affordability, including conditions relating to housing finance, housing construction activity and costs, economic growth, population, alternative investments and taxation. In the long run, the results indicate that the primary drivers of affordability are housing finance, dwelling approvals and financial assets. Interestingly, economic and population growth only have an influence on affordability in the short run, while taxation related to housing has only a limited impact on affordability in the long run. The findings also indicate the high-speed adjustment following a shock to the short-run equilibrium of deteriorating housing affordability in Australia.
本文利用1985年9月至2010年6月期间的季度汇总数据和自回归分布滞后(ARDL)方法,对澳大利亚住房负担能力的宏观驱动因素进行了建模。我们采用两种相对住房负担能力的替代措施:住房行业协会的住房负担能力指数和住房价格-收入乘数。然后使用六组变量来代表影响住房负担能力的经济、人口、金融、社会和其他因素,包括与住房融资、住房建设活动和成本、经济增长、人口、替代投资和税收有关的条件。从长远来看,结果表明,可负担性的主要驱动因素是住房融资、住宅审批和金融资产。有趣的是,经济和人口增长只在短期内对可负担性有影响,而与住房相关的税收对长期可负担性的影响有限。调查结果还表明,澳大利亚住房负担能力恶化的短期均衡受到冲击后,房价出现了高速调整。
{"title":"Macro Drivers of Australian Housing Affordability, 1985–2010: An Autoregressive Distributed Lag Approach","authors":"A. Worthington, H. Higgs","doi":"10.2139/ssrn.1913972","DOIUrl":"https://doi.org/10.2139/ssrn.1913972","url":null,"abstract":"This paper models the macro drivers of Australian housing affordability using aggregate quarterly data over the period September 1985 to June 2010 and an autoregressive distributed lag (ARDL) approach. We employ two alternative measures of relative housing affordability: the Housing Industry Association’s Housing Affordability Index and the housing price-earnings multiplier. Six sets of variables are then used to proxy the economic, demographic, financial, social and other factors that influence housing affordability, including conditions relating to housing finance, housing construction activity and costs, economic growth, population, alternative investments and taxation. In the long run, the results indicate that the primary drivers of affordability are housing finance, dwelling approvals and financial assets. Interestingly, economic and population growth only have an influence on affordability in the short run, while taxation related to housing has only a limited impact on affordability in the long run. The findings also indicate the high-speed adjustment following a shock to the short-run equilibrium of deteriorating housing affordability in Australia.","PeriodicalId":331246,"journal":{"name":"24th Australasian Finance & Banking Conference 2011 (Archive)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125781562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
24th Australasian Finance & Banking Conference 2011 (Archive)
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1