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Effects of agricultural market imperfections on rural multidimensional poverty: Evidence from the Sidama region of Ethiopia 农业市场不完善对农村多维贫困的影响:来自埃塞俄比亚西达马地区的证据
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-05 DOI: 10.1080/23311932.2023.2273631
Bealu Tukela Bekata, Ch. Appa Rao, G. Nagaraja
This study investigated the relationship between agricultural market imperfections and multidimensional rural poverty in Ethiopia’s Sidama Region in 2022. And this study used qualitative and quantitative methodologies. A multi-stage sampling method was used to select 400 sample sizes. Descriptive statistics method was used to find out modes of agricultural market imperfections, and Tobit model was employed to capture the effects of agricultural market imperfections on multidimensional rural poverty. And the multidimensional poverty index (MPI) technique was employed to measure the severity of multidimensional rural poverty. Apart from what they have traditionally done by themselves, about 23% of people lack knowledge about how to produce and where to sell using modernized information. The Tobit model was also employed to figure out how market imperfections affected multidimensional poverty in the study area. This study showed that 43% of farmers transport their goods by carrying them on their shoulders to the market. For farmers with asymmetric information, the multidimensional poverty index (MPI) is expected to have a value of 0.4354 higher than those with symmetric information. Furthermore, the Tobit model’s findings showed that labor, improved seed, farm size, cooperative membership, and commercialization experience significantly negatively impacted multidimensional rural poverty. And asymmetric information, transaction cost, and infrastructure inaccessibility had a statistically significant and positive impact on multidimensional poverty. Hence, improving input usage and creating access to agricultural market information is a foundation for reducing multidimensional rural poverty.
本研究调查了2022年埃塞俄比亚西达马地区农业市场不完善与多维农村贫困之间的关系。这项研究使用了定性和定量方法。采用多阶段抽样方法,选取400个样本量。采用描述性统计方法发现农业市场不完善模式,采用Tobit模型捕捉农业市场不完善对农村多维贫困的影响。并采用多维贫困指数(MPI)技术对农村多维贫困程度进行测度。除了他们传统上自己做的事情外,大约23%的人缺乏如何利用现代化信息生产和销售的知识。采用Tobit模型分析了市场不完善对研究地区多维贫困的影响。这项研究表明,43%的农民把他们的货物扛在肩上运到市场。信息不对称农户的多维贫困指数(MPI)比信息对称农户高0.4354。此外,Tobit模型的研究结果表明,劳动力、改良种子、农场规模、合作社成员和商业化经验对农村多维贫困有显著的负面影响。信息不对称、交易成本和基础设施不可及性对多维贫困有显著的正向影响。因此,改善投入物的使用和创造获取农业市场信息的渠道是减少农村多维贫困的基础。
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引用次数: 0
Dissipation profile and risk assessment of diflubenzuron and novaluron in tomato fruits under greenhouse conditions 温室条件下番茄果实中双氟苯脲和新伐螨隆的耗散规律及风险评价
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-03 DOI: 10.1080/23311932.2023.2275393
Mohsen A. M. Alhamami, Jari S. Algethami, Amal F. Seliem, Yaser A. Alnaam, Mohamed F. Ramadan, Osama I. Abdallah
A simple liquid-liquid extraction (LLE) procedure and liquid chromatography-tandem mass spectrometer (LC-MS/MS) were validated to analyze the residues of diflubenzuron and novaluron in tomatoes. Validation criteria included; linearity in the range of 2–100 μg.kg−1 and 5–200 μg.kg−1 with a correlation coefficient (R2) of ≥ 0.998, trueness (% recovery) of 90.55–97.51% at spiking levels of 10, 100, and 1000 mg.kg−1, the limit of detection (LOD) of 0.46 and 3.22 μg.kg−1, the limit of quantitation (LOQ) of 5 and 10 μg.kg−1, intraday repeatability (RSDr) of 9.31% and 6.63%, and inter-day repeatability (RSDR) of 13.72% and 8.87%, respectively for diflubenzuron and novaluron. Due to the matrix effect, negligible enhancement in instrument response was observed for the tested analytes. The dissipation behaviour of diflubenzuron (24 % SC) and novaluron (10 % EC) in greenhouse tomatoes after treatment with 192 and 40 g a.i. ha-1 (authorized dosage) and 336 and 80 g a.i. ha-1 (high dosage) was investigated. Dissipation kinetics were best fitted to the first-order reaction. Despite the application dose for novaluron being about three times smaller compared to diflubenzuron, the residues of novaluron dissipated more rapidly than those of diflubenzuron with constant rates (k) of 0.342–0.356 and 0.194–0.154 day-1 and half-lives (t0.5) of 1.77–1.73 and 3.57–4.49 days respectively, at the doses tested. The terminal residues of diflubenzuron and novaluron were 0.013–0.328 and 0.011–0.171 mg.kg-1 after 2 and 3 times application, respectively. The calculated risk quotients were less than 1, indicating that spraying tomatoes with the tested insecticides at the applied doses poses no significant potential risks to Saudi consumers.
采用简单液液萃取(LLE)法和液相色谱-串联质谱联用(LC-MS/MS)法测定番茄中灭氟脲和新伐螨隆的残留量。验证标准包括:在2-100 μg范围内呈线性。Kg−1和5-200 μg。kg−1,相关系数(R2)≥0.998,在10、100、1000 mg的浓度下,确度(回收率)为90.55 ~ 97.51%。kg−1,检出限(LOD)分别为0.46和3.22 μg。kg−1,定量限分别为5和10 μg。kg−1,日内重复性(RSDr)分别为9.31%和6.63%,日间重复性(RSDr)分别为13.72%和8.87%。由于基质效应,仪器响应的增强可以忽略不计。研究了192和40 g a.i. ha-1(授权剂量)和336和80 g a.i. ha-1(高剂量)对温室番茄中灭氟虫隆(24% SC)和新伐虫隆(10% EC)的耗散行为。耗散动力学最适合于一级反应。尽管新伐虫隆的施用剂量比灭氟苯脲小约三倍,但在试验剂量下,新伐虫隆的残留消散速度比灭氟苯脲快,其恒定速率(k)分别为0.342 ~ 0.356天和0.194 ~ 0.154天,半衰期(t0.5)分别为1.77 ~ 1.73天和3.57 ~ 4.49天。灭氟脲和新伐螨隆的末端残留量分别为0.013 ~ 0.328 mg和0.011 ~ 0.171 mg。Kg-1分别施用2次和3次。计算出的风险商数小于1,表明按所施剂量向番茄喷洒试验杀虫剂对沙特消费者没有显著的潜在风险。
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引用次数: 0
Assessing the influence of feeding olive leaves on the productivity and economic viability of growing Awassi lambs 评估饲喂橄榄叶对饲养阿瓦西羔羊的生产力和经济活力的影响
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-03 DOI: 10.1080/23311932.2023.2277518
Belal S. Obeidat, Milton G. Thomas
The goal was to assess the influence of feeding olive leaves (OL) as a roughage source on nutrient intake, nutrient digestibility, N balance, growth performance and carcass characteristics of growing Awassi lambs. Twenty-four male lambs (initial body weight (BW) = 16.82 ± 0.998 kg; age = 70 ± 1.25 days) were randomly assigned to two isonitrogenous diets; OL at 0 (CON) or 150 (OL150) g/kg of dietary dry matter (DM). Diets were fed ad libitum for a period of 60 days after 7 days of adaptation. Feed intake and refusals were recorded daily. Body weights were recorded at the beginning of the study and at biweekly intervals thereafter. Intake of DM and crude protein was similar (P ≥ 0.05) between the two diets. Feeding OL decreased (P ≤ 0.01) intake of neutral detergent fiber and acid detergent fiber whereas it increased (P = 0.001) intake of ether extract compared with the CON diet. No differences (P ≥ 0.05) were observed in the final BW, average daily gain, and total gain between diets. However, the cost of gain was lower (P = 0.05) in lambs fed the OL diet versus the CON diet. None of the carcass characteristics nor meat quality parameters differed between the two diets. In summary, feeding olive leaves at 150 g/kg did not influence growth performance and carcass characteristics and meat quality but improved the economic value of using such products in diets of growing lambs. In addition, the use of this product has a positive impact on reducing environmental pollution.
本试验旨在研究饲用橄榄叶作为粗饲料对生长期阿瓦西羔羊营养物质采食量、营养物质消化率、氮平衡、生长性能和胴体特性的影响。公羊羔24只(初始体重= 16.82±0.998 kg);年龄= 70±1.25日龄)随机分为两组等氮饲粮;0 (CON)或150 (OL150) g/kg日粮干物质(DM)时的OL。预试期7 d后,饲喂自由采食60 d。每天记录采食量和拒绝食量。在研究开始时和之后每两周记录一次体重。两种饲粮的干物质和粗蛋白质采食量相近(P≥0.05)。与CON相比,饲喂OL降低了中性洗涤纤维和酸性洗涤纤维的采食量(P≤0.01),提高了粗脂肪采食量(P = 0.001)。两种饲粮的最终体重、平均日增重和总增重均无差异(P≥0.05)。相比于对照组,OL组羔羊的增重成本更低(P = 0.05)。两种日粮的胴体特征和肉质参数均无差异。综上所述,饲喂150 g/kg橄榄叶不影响生长羔羊的生长性能、胴体特性和肉品质,但提高了该产品在生长羔羊日粮中的经济价值。此外,使用本产品对减少环境污染有积极的影响。
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引用次数: 0
Review on successful soil conservation methods in Ethiopia 埃塞俄比亚成功土壤保持方法综述
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-03 DOI: 10.1080/23311932.2023.2274171
Dilnesa Bayle, Kelemu Muluye
Ethiopia’s low agricultural productivity and loss of soil nutrients are primarily due to land degradation. By interfering with natural processes, it deteriorates soil properties and endangers agricultural production. Different soil and water conservation (SWC) practices have been implemented in many regions of Ethiopia to combat it. Reviewing successful soil conservation methods in Ethiopia and their impacts on soil properties, agricultural productivity, and technical soil conservation quality are the main goals of this paper. Data were gathered from a range of sources, including publications on soil conservation, conferences, thesis works, and periodicals. SWC practices had either a positive or negative impact on the soil’s physicochemical characteristics and crop productivity. Under both biological and integrated SWC practices, the mean values of pH, TN, AVP, OM, and CEC were higher on treated farmland than on untreated farmland. Under all SWC practices, the average bulk density was higher on acreage that had not been treated than it had been. By effectively using SWC technology and integrating physical and biological measures, the technique for repairing soil physicochemical properties, reducing soil erosion, and enhancing agricultural productivity would be improved. In order to improve technical quality, soil quality, crop yields, and society’s means of subsistence, it is therefore possible to advise that the layout of conservation measures, intensive capacity building about the layout of structures, and standard procedure be followed.
埃塞俄比亚农业生产力低下和土壤养分流失的主要原因是土地退化。通过干扰自然过程,它使土壤性质恶化,危及农业生产。埃塞俄比亚的许多地区已经实施了不同的水土保持(SWC)措施来对抗它。回顾埃塞俄比亚成功的土壤保持方法及其对土壤性质、农业生产力和技术土壤保持质量的影响是本文的主要目标。数据收集的来源广泛,包括关于土壤保持的出版物、会议、论文和期刊。SWC做法对土壤理化特征和作物生产力有积极或消极的影响。在生物和综合SWC措施下,处理农田的pH、TN、AVP、OM和CEC均值均高于未处理农田。在所有SWC方法下,未处理面积的平均堆积密度高于处理面积。通过有效利用SWC技术,将物理和生物措施相结合,可以改善修复土壤理化性质、减少土壤侵蚀、提高农业生产力的技术。为了提高技术质量、土壤质量、作物产量和社会生活资料,可以建议采取保护措施布局、加强结构布局能力建设和规范程序。
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引用次数: 0
Comparison of fatty acid composition in seed kernels of tea plant ( Camellia sinensis ), between conventional cultivars and albino cultivars 茶树(Camellia sinensis)籽粒脂肪酸组成的比较,在常规品种和白化品种之间
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-02 DOI: 10.1080/23311932.2023.2272464
Yuewei Li, Yao Zhu, Shuangjie Huang, Jinlei Luo, Mufang Sun, Yi Chen, Shuangfeng Jiang, Guiyi Guo, Yali Chang
Woody plants are important sources of edible oil, and the tea plant (Camellia sinensis) is a new option. In this study, the contents and composition of fatty acids in seed kernels of 10 conventional cultivars and 4 albino cultivars were analyzed and compared by GC-MS. A total of 22 fatty acids were identified. The main fatty acids were oleic acid (C18:1Δ9) (9.1051–15.0670%), linoleic acid (C18:2Δ9,12) (3.6386–7.7231%), and palmitic acid (C16:0) (2.3660–3.9445%), respectively. The ratio of saturated fatty acids, monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids of albino cultivar “Zhonghuang 2” (ZH No.2) was 1.00:2.67:1.85, of which the proportion of MUFAs was significantly lower than those of most conventional cultivars and albino cultivar “Suyuhuang”. Therefore, it is necessary to determine the chemical constituents before the development and utilization of tea seeds, especially for albino cultivars. Furthermore, ZH No.2 could be chosen as parent for improving the fatty acid composition of tea seeds in the breeding project.
木本植物是重要的食用油来源,茶树(Camellia sinensis)是一个新的选择。采用气相色谱-质谱法对10个普通品种和4个白化品种籽粒中脂肪酸的含量和组成进行了分析比较。共鉴定出22种脂肪酸。主要脂肪酸为油酸(C18:1Δ9)(9.1051 ~ 15.0670%)、亚油酸(C18:2Δ9,12)(3.6386 ~ 7.7231%)和棕榈酸(C16:0)(2.3660 ~ 3.9445%)。白化品种“中黄2号”(ZH 2号)的饱和脂肪酸、单不饱和脂肪酸(MUFAs)和多不饱和脂肪酸的比值为1.00:2.67:1.85,其中MUFAs的比例显著低于大多数常规品种和白化品种“素玉黄”。因此,在开发利用茶籽,特别是白化品种茶籽前,有必要对其化学成分进行测定。此外,在育种项目中,可以选择ZH 2号作为亲本来改善茶叶种子脂肪酸组成。
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引用次数: 0
Impacts of improved agricultural technologies on food security and child nutrition in rural Ethiopia 改进农业技术对埃塞俄比亚农村粮食安全和儿童营养的影响
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-02 DOI: 10.1080/23311932.2023.2276565
Tsegaye Mulugeta Habtewold, Almas Heshmati
New agricultural technologies and improved practices play a key role in increasing agricultural production and productivity, as well as improving national food security and overall social well-being. A large body of empirical literature shows how different technologies and improved practices can affect welfare indicators. However, rigorous evidence on the food security and nutritional implications of these technologies remains scarce in general and particularly in developing regions such as sub-Saharan Africa. This study uses panel data and adopts a fixed-effects approach as the main analysis method. Propensity score matching and endogenous treatment effects techniques are also used to test robustness and reduce selection bias in the estimation process. Thus, this study examines the relationship between adoption and nutrition, which has received little attention in most previous studies, and evaluates the impacts of three improved agricultural technologies (row planting, high-yielding seed varieties, and chemical fertilizers) on household food security and child nutrition. The results of the study show that the adoption of these technologies had a significant impact on both per capita consumption expenditure and child nutrition. In addition, the results of the differential impact analysis confirmed that impacts differed across the different segments of the households (quartiles based on area under improved technology and gender). We, thus, recommend the use of advanced agricultural technologies in combination (multiple types) rather than as separate technologies, and relevant institutions should promote the combination of advanced agricultural technologies, and the need for continued and large-scale public and private investment in the sector to address major development challenges. Finally, we note that the results from the current study have a broad and generic value that can be applied to a range of related cases in other developing countries.
新的农业技术和改进的做法在提高农业生产和生产力以及改善国家粮食安全和整体社会福祉方面发挥着关键作用。大量实证文献表明,不同的技术和改进的做法如何影响福利指标。然而,关于这些技术对粮食安全和营养影响的严格证据总体上仍然很少,特别是在撒哈拉以南非洲等发展中地区。本研究采用面板数据,采用固定效应法作为主要分析方法。倾向得分匹配和内源性处理效应技术也用于检验稳健性和减少估计过程中的选择偏差。因此,本研究考察了收养与营养之间的关系,并评估了三种改良农业技术(行栽、高产种子品种和化肥)对家庭粮食安全和儿童营养的影响,这在以往的研究中很少受到关注。研究结果表明,采用这些技术对人均消费支出和儿童营养都产生了重大影响。此外,差异影响分析的结果证实,不同家庭阶层的影响不同(四分位数基于改进技术的地区和性别)。因此,我们建议将先进农业技术结合使用(多种类型),而不是单独使用,相关机构应促进先进农业技术的结合,以及在该领域持续、大规模的公共和私人投资的必要性,以应对重大发展挑战。最后,我们注意到,当前研究的结果具有广泛和普遍的价值,可以应用于其他发展中国家的一系列相关案例。
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引用次数: 0
Determinants of effective cattle disease management among smallholder farmers in light of rapid theileriosis outbreaks and economic losses: The case of Mutare rural district, Manicaland province, Zimbabwe 考虑到小农肠弧菌病的迅速暴发和经济损失,对小农进行有效牛病管理的决定因素:津巴布韦马尼兰省穆塔雷农村地区的案例
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-02 DOI: 10.1080/23311932.2023.2275419
Ndakazonzwa Tirivanhu, Freddy Ruzhani, Newettie Jambo
Smallholder farmers face significant challenges in effectively managing their cattle due to the rapid outbreaks of theileriosis and other tick-borne diseases, resulting in severe economic losses. These outbreaks pose significant threats to food security and rural livelihoods, yet there is a lack of understanding of the factors affecting effective cattle disease management among smallholder farmers. In this paper, we determine the factors affecting effective cattle disease management in Mutare rural district, Zimbabwe. We quantify the economic losses associated with cattle diseases which we use as a proxy for effective cattle management. Multiple linear regression was used to analyse the data. Six wards were chosen at random among 36 wards in the district, and primary data was gathered from 90 randomly selected farmers. The results showed that cattle diseases cause significant losses in the rural Mutare district, with an average loss of US$ 1 288.87 per farmer during the two years under study. The level of education of the household head, access to an animal health officer, and training on cattle diseases are significant variables in reducing economic losses due to cattle diseases at 5% while formal credit access was found to be statistically significant at 1% significance level. To lessen the losses brought on by cattle diseases, we recommend the government raise the number of animal health officers, strengthen training programs on preventing and controlling cattle diseases, invest in the development of a comprehensive disease-reporting network, and the creation of policies that incentivize banks to lend money to farmers.
小农在有效管理牛群方面面临重大挑战,因为他们的肠杆菌病和其他蜱传疾病迅速爆发,造成严重的经济损失。这些疫情对粮食安全和农村生计构成重大威胁,但人们对影响小农有效管理牛瘟的因素缺乏了解。在本文中,我们确定了影响有效的牛疾病管理的因素在穆塔雷农村地区,津巴布韦。我们量化了与牛疾病相关的经济损失,并以此作为有效管理牛的指标。采用多元线性回归对数据进行分析。在全区36个病区中随机抽取6个病区,随机抽取90名农户进行初步数据采集。结果表明,牛疾病在穆塔雷农村地区造成重大损失,在研究的两年中,每个农民平均损失1 288.87美元。户主的受教育程度、获得动物卫生官员的服务和牛疾病培训是减少牛疾病造成的经济损失的重要变量(5%),而获得正规信贷在统计上具有显著意义(1%)。为了减少牛疾病带来的损失,我们建议政府增加动物卫生官员的数量,加强预防和控制牛疾病的培训项目,投资发展一个全面的疾病报告网络,并制定激励银行向农民贷款的政策。
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引用次数: 0
Dynamics of micronutrients of fresh and stale tomatoes ( lycopersicum esculentum ) sold within Umuahia metropolis in Nigeria as a function of handling practices 尼日利亚乌穆阿伊亚市出售的新鲜和不新鲜番茄(番茄)微量营养素动态与处理方法的关系
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-01 DOI: 10.1080/23311932.2023.2275404
Innocent Nwazulu Okwunodulu, Sara Chidimma Ozioko, Felicia Uchechukwu Okwunodulu, V. C. Ezeocha
Tomatoes are soft tissue perishable fruits high susceptible to bruises during loading, transportation, unloading, and retailing which lead to their deterioration and nutrient losses. This study explored the micronutrient changes in the fresh (whole) and stale (nkuwa) tomatoes during loading, transportation, unloading, distribution and retail sales in the three major retail market outlets in Umuahia metropolis with standard methods of analyses. The results of micronutrients (pro-vitamin A, vitamins B1, B2, B3 and C, calcium, magnesium, potassium, zinc, sodium and iron) evaluated revealed significant (p < 0.05) decrease for the entire stale tomato samples compared to their whole counterparts. With increase in distance from the landing bay, pro-vitamin A (β carotene) (598.36–579.64 µg/100 g), B1 (0.07–0.04 mg/100 g), B2 (0.05–0.03 mg/100 g), B3 (0.97–0.87 mg/100 g) and vitamin C (20.14–19.29 mg/100 g) decreased. Also the minerals (mg/100 g), calcium (16.15–15.77), potassium (409.71–409.62), magnesium (19.45–18.73), sodium (8.77–8.74), iron (0.42–0/35) and zinc (0.33–0.29) decreased. Micronutrient losses increased with increase in handling practices from the landing bay till it gets to the end users. Long-distance tomato transportation should be on smooth roads in the night inside rigid plastic crates to reduce bruises.
西红柿是一种软组织易腐烂的水果,在装载、运输、卸载和零售过程中极易受到擦伤,从而导致其变质和营养流失。本研究以标准的分析方法,探讨鲜(整)蕃茄和不新鲜(鲜)蕃茄在乌茂亚市三大零售市场的装载、运输、卸载、配送和零售过程中微量元素的变化。微量元素(维生素A原、维生素B1、B2、B3和C、钙、镁、钾、锌、钠和铁)的测定结果显示,与全番茄相比,全番茄腐熟后番茄的微量元素含量显著降低(p < 0.05)。随着离着陆舱距离的增加,原维生素A (β -胡萝卜素)(598.36 ~ 579.64µg/100 g)、B1 (0.07 ~ 0.04 mg/100 g)、B2 (0.05 ~ 0.03 mg/100 g)、B3 (0.97 ~ 0.87 mg/100 g)和维生素C (20.14 ~ 19.29 mg/100 g)降低。矿物质(mg/100 g)、钙(16.15-15.77)、钾(409.71-409.62)、镁(19.45-18.73)、钠(8.77-8.74)、铁(0.42-0/35)和锌(0.33-0.29)含量也有所下降。微量营养素的损失随着从着陆舱到最终使用者的处理方法的增加而增加。西红柿的长途运输应在平整的路面上进行,夜间装在坚硬的塑料板条箱内,以减少擦伤。
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引用次数: 0
Street vended foods in Nigeria: An analysis of the current state of affairs and the way forward 尼日利亚街头摊贩食品:现状分析及未来发展方向
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-11-01 DOI: 10.1080/23311932.2023.2266194
Ifeanyi Michael Mazi, Helen Onyeaka, Hope Akegbe, Esther Ibe Njoagwuani, Chidinma Ezinne Ochulor, Iyiola Olatunji Oladunjoye, Adeola Dolapo Omotosho, Ogueri Nwaiwu, Phemelo Tamasiga, Olumide A. Odeyemi
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引用次数: 0
Comparison of some characteristics of cashew nut production in two agroecological zones of Burkina Faso 布基纳法索两个农业生态区腰果生产若干特征的比较
4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Pub Date : 2023-10-31 DOI: 10.1080/23311932.2023.2272489
Naamwin Irkoum Zephirin Somda, Juliana Amaka Ugwu, Madjelia Cangré Ebou Dao
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引用次数: 0
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