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Urban Gardening—How Safe Is It? 城市园艺--有多安全?
Pub Date : 2024-07-19 DOI: 10.3390/urbansci8030091
K. Hubai, N. Kováts, B. Eck-Varanka
Urban gardening has become more and more popular in recent years, as people might prefer to grow their own vegetables from controlled sources. In addition, community building also plays a key role. However, air pollution in settlements is a serious hazard affecting the quality of home-grown vegetables. During the vegetation period, traffic is the main factor generating atmospheric particulate matter. These particles will, in turn, bind to potentially toxic compounds, of which heavy metals and polycyclic aromatic hydrocarbons (PAHs) are the most widely studied and discussed. In addition to their potential toxicity, both groups contain carcinogenic species. Heavy metals, as well as PAHs, are capable of bioaccumulation, depending on the element or compound’s characteristics and the vegetable species. Some leafy vegetables can accumulate these toxic materials in significant quantities. As dietary uptake is considered the major exposure route of both heavy metals and PAHs, the consumption of impacted vegetables might even pose human health risks. This recent review summarises available data reported on heavy metal and PAH accumulation in urban environments, specified by vegetable species. Also, the assessment of possible human impact is given.
近年来,城市园艺越来越受欢迎,因为人们可能更喜欢从可控来源种植自己的蔬菜。此外,社区建设也发挥了重要作用。然而,居住区的空气污染是影响自家种植蔬菜质量的严重隐患。在植被生长期,交通是产生大气颗粒物的主要因素。这些微粒反过来又会与潜在的有毒化合物结合,其中重金属和多环芳烃(PAHs)是研究和讨论最为广泛的物质。除潜在毒性外,这两类物质还含有致癌物质。重金属和多环芳烃具有生物蓄积性,这取决于元素或化合物的特性和蔬菜种类。一些叶菜类蔬菜会大量积累这些有毒物质。由于膳食摄入被认为是接触重金属和多环芳烃的主要途径,因此食用受影响的蔬菜甚至可能对人类健康造成危害。这篇最新综述总结了有关城市环境中重金属和多环芳烃积累的现有数据,并按蔬菜种类进行了具体说明。此外,还对可能对人类造成的影响进行了评估。
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引用次数: 0
Stormwater Management: An Integrated Approach to Support Healthy, Livable, and Ecological Cities 雨水管理:支持健康、宜居和生态城市的综合方法
Pub Date : 2024-07-18 DOI: 10.3390/urbansci8030089
Neil S. Grigg
The practice of stormwater management has evolved from a singular focus on drainage to a multifaceted approach to support the integrated urban development of healthy, livable, ecological, and water sensitive cities from neighborhood to metropolitan scales. A review of the knowledge base and practice by the professional stormwater management community shows attributes that favor an integrative approach to achieve co-benefits across sectors. Research into stormwater management addresses its functional areas of drainage, flood control, flood plain management, water quality control, urban ecology, recreation, and city beautification. Legacy path dependance affects the potential to reform land use practices, while stormwater management practice is affected by climate change, sea level rise, urbanization, inequality, and poor governance. This review shows a status where technical methods are well advanced but integrative frameworks to address social, ecological and infrastructure needs are more challenging. The sensitivity of ecological issues is most evident in cities in coastal zones. Organizational initiatives are needed to counter the neglect of essential maintenance and sustain flood risk reduction in cities. Stormwater management is related to other integrative tools, including IWRM, One Water, One Health, and Integrated Flood Management, as well as the broader concept of urban planning. This research review demonstrates the opportunities and needs for the advancement of an integrated approach to stormwater management to support urban development. Stormwater capture and rainfall harvesting offer major opportunities to augment scarce water supplies. Nature-based solutions like low-impact development and the sponge city concept show promise to transform cities. Major cities face challenges to sustain conveyance corridors for major flows and to store and treat combined sewer runoff. The neighborhood focus of stormwater management elevates the importance of participation and inclusion to advance environmental justice and strengthen social capital. Integrating organizational initiatives from local to city scales and funding improvements to stormwater systems are major challenges that require leadership from higher governance levels, although governments face resistance to change toward integration, especially in countries with poor land use and public works management systems. Finding solutions to neighborhood issues and the connectivity of water systems at larger scales requires complex approaches to urban planning and represent an important agenda for urban and water governance going forward.
雨水管理的实践已从单一的排水发展为多方面的方法,以支持健康、宜居、生态和对水敏感的城市的综合发展,从社区到大都市。对专业雨水管理团体的知识基础和实践进行的回顾表明,他们倾向于采用综合方法来实现跨部门的共同利益。雨水管理研究涉及排水、防洪、洪泛平原管理、水质控制、城市生态、娱乐和城市美化等功能领域。历史遗留的路径依赖影响了改革土地利用方式的潜力,而雨水管理实践则受到气候变化、海平面上升、城市化、不平等和治理不善的影响。本次审查表明,技术方法已经非常先进,但解决社会、生态和基础设施需求的综合框架更具挑战性。生态问题的敏感性在沿海地区的城市最为明显。需要采取组织措施来解决忽视基本维护的问题,并持续降低城市的洪水风险。暴雨管理与其他综合工具相关,包括水资源综合管理、"同一水源、同一健康 "和洪水综合管理,以及更广泛的城市规划概念。本研究综述展示了推进雨水管理综合方法以支持城市发展的机遇和需求。雨水收集和雨水集蓄为增加稀缺的水资源供应提供了重要机会。以自然为基础的解决方案,如低影响开发和海绵城市概念,为城市转型带来了希望。大城市在维持主要水流的输送走廊以及储存和处理合流污水径流方面面临挑战。雨水管理以社区为重点,提高了参与和包容的重要性,以促进环境正义和加强社会资本。整合从地方到城市范围内的组织倡议以及为改善雨水系统提供资金是一项重大挑战,需要更高治理水平的领导,尽管政府在向整合方向转变时面临阻力,特别是在土地利用和公共工程管理系统不完善的国家。要找到解决邻里问题和更大规模水系统连通性的办法,需要复杂的城市规划方法,这也是未来城市和水治理的一个重要议程。
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引用次数: 0
Regional Innovation Systems as a Remedy for Structurally Affected Regions—Empirical Evidence from the Czech Republic 区域创新体系作为受结构影响地区的补救措施--来自捷克共和国的经验证据
Pub Date : 2024-07-18 DOI: 10.3390/urbansci8030088
Adam Janošec, G. Chmelíková, Ivana Blažková, Kristina Somerlikova
Structurally affected regions face a necessary economic transformation, for which the efficiency of public financial support is crucial. Regional innovation systems represent a modern approach to regional and urban development focusing on innovation and research activities. The aim of this study is to assess whether there is a difference in the effect of public R&D funding on the development of a region’s innovation environment between structurally affected and other regions. The beta convergence and the method of calculating the average efficiency of public funds were used to meet the objective of this research. The analysis was conducted on data from 2012 to 2022 in 14 regions of the Czech Republic. The results show that public support for R&D has a positive effect on development of the innovation environment in structurally affected regions in the Czech Republic and that there is a difference in the effect of this support regarding structurally affected regions versus developed regions. These affected regions on average respond better to public financial support for R&D than mature regions. In contrast, the efficiency of public financial support is lower in regions with a strongly developed innovation system.
受结构影响的地区面临着必要的经济转型,为此,公共财政支持的效率至关重要。区域创新体系代表了一种以创新和研究活动为重点的现代区域和城市发展方法。本研究旨在评估受结构性影响地区与其他地区之间,公共研发资金对地区创新环境发展的影响是否存在差异。为实现这一研究目标,我们采用了贝塔收敛法和公共资金平均效率计算方法。分析以捷克共和国 14 个地区 2012 年至 2022 年的数据为基础。结果表明,对研发的公共支持对捷克共和国受结构性影响地区的创新环境发展具有积极影响,而且这种支持对受结构性影响地区与发达地区的影响存在差异。这些受影响地区对公共财政研发支持的平均反应优于成熟地区。相比之下,在创新体系非常发达的地区,公共财政支持的效率较低。
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引用次数: 0
Resilient Urban-Design Strategies for Landslide Risk Mitigation in Huaraz, Peru 秘鲁瓦拉斯减轻山体滑坡风险的弹性城市设计战略
Pub Date : 2024-07-18 DOI: 10.3390/urbansci8030090
Doris Esenarro, John Manosalva, Lizeth Sanchez, Carlos Vargas, Vanessa Raymundo, Jimena Ccalla
The present research aims to propose resilient urban-design strategies to mitigate the risk of landslides in Huaraz. This study addresses the growing challenge of climate change and its influence on the occurrence of avalanches in Huaraz, Peru. The methodology employed included a literature review, site analysis using digital tools, and the formulation of resilient urban-design strategies. As a result, a Master Plan for Urban Resilience is proposed, using a detailed literature review, climate studies, and topographic evaluation to design urban strategies that enhance the city’s sustainability and safety. The proposed interventions, including channel expansion, installation of gabions and containment meshes, reforestation, and strategic relocation of housing, demonstrate significant potential to reduce vulnerability to avalanches. This multidisciplinary approach underscores the necessity of integrating urban adaptations in response to extreme climate variations in the Andean regions. The proposal stands out for its innovation and resilience, precisely aligning with the unique characteristics of Huaraz. The comprehensive strategy not only focuses on urban regeneration and risk prevention but also aims to significantly improve the community’s quality of life.
本研究旨在提出具有抗灾能力的城市设计战略,以减轻瓦拉斯的山体滑坡风险。本研究探讨了气候变化带来的日益严峻的挑战及其对秘鲁瓦拉斯发生雪崩的影响。采用的方法包括文献综述、使用数字工具进行现场分析,以及制定具有抗灾能力的城市设计战略。通过详细的文献综述、气候研究和地形评估,提出了 "城市抗灾总体规划",以设计提高城市可持续性和安全性的城市战略。建议采取的干预措施包括扩建渠道、安装石笼网和防护网、重新植树造林以及战略性搬迁住房,这些措施在降低雪崩脆弱性方面具有巨大潜力。这种多学科方法强调了整合城市适应措施以应对安第斯地区极端气候变异的必要性。该提案因其创新性和复原力而脱颖而出,与瓦拉斯的独特性不谋而合。该综合战略不仅注重城市复兴和风险预防,还旨在显著提高社区的生活质量。
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引用次数: 0
Strategies and Actions’ Definition for the New Territorial Government Plan of Voghera, Italy: Towards a Healthier City 意大利沃盖拉新地方政府计划的 "战略与行动 "定义:建设更健康的城市
Pub Date : 2024-07-17 DOI: 10.3390/urbansci8030087
Roberto De Lotto, C. Pietra, Matilde Sessi, E. Venco
Cities require flexible and participatory planning methodologies to address complex and evolving urban challenges. In Italy, the legislative framework is defined at the regional level according to national laws and jurisprudence. The Lombardy region introduced the Planning Document (PD) in the Territorial Government Plan (PGT) as a strategic tool capable of adapting to changes. Based on a strategic vision, this document guides concrete actions for urban transformation, actively involving stakeholders, including citizens. The PD’s role is to translate the political program into an urban planning design, encompassing both technical and political dimensions. The political aspect is usually emphasized in the strategic component of the document. Following the formation process of the whole city plan, the authors define the key strategies in the PD for a healthier urban future for the city of Voghera. It emerges as a balanced urban development that combines economic growth, environmental preservation, and community well-being. In the paper, the authors synthesize Voghera’s PD as an example of strategic planning that interacts with practical planning actions and guides both public and private decisions about the city’s development toward a healthier city.
城市需要灵活的参与式规划方法,以应对复杂和不断变化的城市挑战。在意大利,立法框架是根据国家法律和判例在地区层面确定的。伦巴第大区在领土政府计划(PGT)中引入了规划文件(PD),作为能够适应变化的战略工具。该文件以战略愿景为基础,指导城市转型的具体行动,并让包括市民在内的利益相关者积极参与其中。城市发展计划的作用是将政治纲领转化为城市规划设计方案,包括技术和政治两个方面。政治方面通常在文件的战略部分得到强调。根据整个城市规划的形成过程,作者在规划文件中确定了沃盖拉市未来城市健康发展的关键战略。它是经济增长、环境保护和社区福祉相结合的平衡城市发展。在本文中,作者将沃盖拉市的总体规划作为战略规划的一个范例进行了总结,该战略规划与实际规划行动相互作用,并指导公共和私人决策,使城市朝着更健康的方向发展。
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引用次数: 0
Unlocking Trends: Socio-Demographic Insights into Bike Sharing from the 2017 National Household Travel Survey 揭示趋势:2017年全国家庭出行调查对共享单车的社会人口学洞察
Pub Date : 2024-07-16 DOI: 10.3390/urbansci8030086
Chia-Yuan Yu
The implementation of bike-sharing systems represents a novel strategy aimed at enhancing urban mobility by offering shared bicycle services to improve accessibility and user convenience. Nevertheless, there has been a limited exploration into the user demographics of bike-sharing programs on a national scale. This study investigates the socio-demographic characteristics of bike-sharing system users, leveraging the 2017 National Household Travel Survey and negative binomial regression models. It finds that bike-sharing usage is more common among users than non-users, with African American and Hispanic individuals using the system more than other racial groups. Furthermore, low-income individuals (
共享单车系统的实施是一项新颖的战略,旨在通过提供共享单车服务来提高城市流动性,从而改善可达性和用户便利性。然而,目前在全国范围内对共享单车项目用户人口统计的研究还很有限。本研究利用 2017 年全国家庭出行调查和负二项回归模型,调查了共享单车系统用户的社会人口特征。研究发现,共享单车在用户中的使用率高于非用户,其中非裔美国人和西班牙裔美国人的使用率高于其他种族群体。此外,低收入人群(<15,000 美元)和高密度地区(每平方英里≥25,000 人)的居民更倾向于使用共享单车。这项研究强调了国家层面缺乏对共享单车用户人口统计的研究,并建议未来的政策和规划应满足特定人群的需求,旨在通过共享单车服务提高城市流动性和可达性。
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引用次数: 0
Actuated Signal Timing Optimization for a No-Notice Evacuation with High Left-Turn Demands 针对高左转需求的无通知疏散进行驱动信号配时优化
Pub Date : 2024-07-12 DOI: 10.3390/urbansci8030085
Md Toushik Ahmed Niloy, Ryan N. Fries
The determination of the appropriate traffic signal timing plans for no-notice evacuations in densely populated areas is a noteworthy challenge. The objective of this study was to evaluate alternatives that could optimize evacuee traffic flow in a no-notice evacuation of areas near an oil refinery. This simulation case study focused on a residential area in the City of Wood River, Illinois, and used Synchro 8.0 and VISSIM 7.0. This case study was different from existing evacuation literature because of the high left-turn demand from evacuating traffic. The study methods were unique because of the application of dynamic traffic assignment, a left-turn movement on the evacuation route, and the simulation of fully-actuated traffic signals. These scenarios evaluated the following: (1) existing traffic infrastructure; (2) flexible shelter choice; and (3) optimized traffic signal timing with flexible shelter choice. The results suggested that optimizing the signal timing and allowing drivers’ flexibility in choosing evacuation routes achieved the fastest evacuation. These findings indicated that a longer cycle length and an extended left-turn phase were important factors in reducing traffic delay in the network. Overall, these findings underscore the importance of operating intersections efficiently during no-notice evacuations.
在人口稠密地区进行无通知疏散时,如何确定合适的交通信号配时方案是一项值得注意的挑战。本研究的目的是评估在炼油厂附近地区进行无通知疏散时,可优化疏散人员交通流量的替代方案。本模拟案例研究侧重于伊利诺伊州伍德河市的一个居民区,并使用了 Synchro 8.0 和 VISSIM 7.0。该案例研究不同于现有的疏散文献,因为疏散交通的左转需求量很大。研究方法的独特之处在于应用了动态交通分配、疏散路线上的左转运动以及全自动交通信号模拟。这些方案对以下方面进行了评估:(1) 现有交通基础设施;(2) 灵活的避难所选择;(3) 具有灵活避难所选择的优化交通信号配时。结果表明,优化信号配时并允许驾驶员灵活选择疏散路线可实现最快疏散。这些结果表明,较长的周期长度和延长的左转阶段是减少交通网络中交通延误的重要因素。总之,这些研究结果强调了在无通知疏散期间有效运行交叉口的重要性。
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引用次数: 0
The Impact of Short-Term Rental Accommodation in Urban Tourism: A Comparative Analysis of Tourists’ and Residents’ Perspectives 城市旅游中短租住宿的影响:游客和居民观点的比较分析
Pub Date : 2024-07-11 DOI: 10.3390/urbansci8030083
Helena Albuquerque, J. Quintela, Jorge Marques
Urban tourism has witnessed significant growth in recent years, driven by various factors that foster the transformation of urban areas into tourist hotspots. These factors include a rising interest in culture and heritage, ongoing urban redevelopment and conversion processes, and the introduction of new experiences and activities. Two particularly influential factors contributing to this growth are low-cost travel, which facilitates more accessible access to urban destinations, and the emergence of new types of accommodation, such as short-term rental (also known as local accommodation or Airbnb-type accommodation). The sudden and continuous growth of this type of tourist accommodation brings new challenges to cities and local communities. On the positive side, it contributes to job opportunities, the dynamism of the local economy, and urban revitalization. On the other hand, it also represents more difficulty in retaining the local population in city centers, as more and more buildings are converted into hostels and tourist apartments. In this context, it becomes essential to conduct studies evaluating the impacts of these dynamics in urban areas and how they influence residents’ and visitors’ perspectives. Therefore, this study aims to identify the main transformations resulting from short-term rental (STR) development, focusing on the impacts felt by tourists and residents in Porto. A questionnaire was distributed to tourists and residents in Porto’s city center in June 2023. The results reveal differences in opinions between tourists and residents, particularly concerning historical heritage preservation, local population relocation, and reduced housing availability for residents. Nevertheless, there is a similarity in their opinions regarding the stimulus that local accommodation brings to the economy and the rehabilitation of buildings and urban areas. This study reinforces the need to pay more attention to the future development of tourist accommodation in city centers, especially regarding local policies and territorial planning, to balance better tourism development and local communities’ quality of life.
近年来,在促进城市地区转变为旅游热点的各种因素的推动下,城市旅游业出现了大幅增长。这些因素包括:人们对文化和遗产的兴趣日益浓厚、正在进行的城市重建和改造进程以及新体验和新活动的引入。促进这一增长的两个特别有影响力的因素是:低成本旅行,这为更方便地前往城市旅游目的地提供了便利;以及新型住宿方式的出现,如短期租赁(也称为当地住宿或 Airbnb 类型的住宿)。这类旅游住宿的突然和持续增长给城市和当地社区带来了新的挑战。从积极的方面看,它有助于增加就业机会、活跃当地经济和振兴城市。另一方面,随着越来越多的建筑被改建成旅舍和旅游公寓,也给城市中心留住当地居民带来了更多困难。在这种情况下,有必要开展研究,评估这些动态对城市地区的影响,以及如何影响居民和游客的观点。因此,本研究旨在确定短期租赁(STR)发展带来的主要变化,重点关注波尔图游客和居民感受到的影响。本研究于 2023 年 6 月向波尔图市中心的游客和居民发放了调查问卷。结果显示,游客和居民的意见存在差异,尤其是在历史遗产保护、当地人口迁移和居民住房供应减少等方面。然而,在当地住宿对经济的刺激作用以及建筑和城市区域的修复方面,他们的意见却有相似之处。这项研究强调,有必要更加关注城市中心旅游住宿业的未来发展,尤其是地方政策和国土规划方面,以便更好地平衡旅游业发展与当地社区生活质量之间的关系。
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引用次数: 0
From Small to Mega: Evaluating Urban Scale 从小到大:评估城市规模
Pub Date : 2024-07-11 DOI: 10.3390/urbansci8030084
Emily Talen
Scale is a significant although understudied dimension of cities. To better understand scale and flesh out the range of issues and debates involved in its conception, we conducted thirty-three in-depth interviews with a wide range of urban actors: developers, planners, policymakers, leaders of non-profit community organizations, and scholars. We wanted to know how contemporary urban actors in the U.S. conceive of scale as a factor in development? How is “small-scale” vs. “large-” or “mega-scale” differentiated, and are they inter-related? What are the pros and cons of both small- vs. large-scale projects? Four themes emerged from our interviews: scale definition, barriers to small-scale development, scale evaluation, and solutions for overcoming barriers to small-scale development. The point of this survey was to better understand possible responses and attitudes about scale among those involved in the urban development process.
规模是城市的一个重要方面,尽管对它的研究还不够。为了更好地理解规模,并充实其概念所涉及的一系列问题和争论,我们对城市的众多参与者进行了 33 次深入访谈,其中包括开发商、规划师、政策制定者、非营利性社区组织的领导者以及学者。我们想知道美国当代城市参与者是如何看待规模这一发展因素的?小规模 "与 "大规模 "或 "超大规模 "是如何区分的?小型项目与大型项目的利弊是什么?我们在访谈中发现了四个主题:规模定义、小规模发展的障碍、规模评估以及克服小规模发展障碍的解决方案。本次调查的目的在于更好地了解参与城市发展进程的人员对规模的可能反应和态度。
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引用次数: 0
Unraveling the Tourism–Environment–Equity Nexus: A Neighborhood-Scale Analysis of Texas Urban Centers 揭示旅游-环境-公平之间的关系:德克萨斯州城市中心的街区尺度分析
Pub Date : 2024-07-10 DOI: 10.3390/urbansci8030082
Omid Mansourihanis, Ayda Zaroujtaghi, Moein Hemmati, M. J. Maghsoodi Tilaki, Mahdi Alipour
This study explores the complex interplay between air pollution, the socioeconomic conditions, and the tourism density within Texas’s urban landscapes, focusing on Dallas, Houston, San Antonio, and Austin. Despite extensive research on environmental justice and urban tourism separately, few studies have integrated these fields to examine how tourism development intersects with environmental and socioeconomic disparities at a neighborhood level. This research addresses this gap by employing advanced geospatial analyses and multi-criteria decision analysis to reveal the pronounced clustering of stressed communities on urban peripheries, often removed from tourism’s economic benefits. The study uniquely quantifies the spatial mismatches between tourist hotspots and areas of environmental stress, a dimension often overlooked in the environmental justice literature. Local spatial statistics and cumulative impact analysis uncover statistically significant correlations between high poverty levels and elevated air pollution in specific locales. The results show varying patterns across cities, with Austin presenting the lowest inequality levels and San Antonio exhibiting significant disparities. This granular, neighborhood-centric approach provides novel insights into the tourism–environment–equity nexus, addressing the lack of comprehensive studies linking these factors in rapidly growing Texan metropolitan areas. The findings underscore the critical need for targeted policy interventions and neighborhood-specific approaches in diagnosing urban environmental disparities and crafting equitable urban development policies that consider tourism’s impact on local communities.
本研究以达拉斯、休斯顿、圣安东尼奥和奥斯汀为重点,探讨了得克萨斯州城市景观中空气污染、社会经济条件和旅游密度之间复杂的相互作用。尽管对环境正义和城市旅游分别进行了广泛的研究,但很少有研究将这两个领域结合起来,在社区层面研究旅游发展如何与环境和社会经济差距相互影响。本研究采用先进的地理空间分析和多标准决策分析,揭示了压力社区在城市边缘的明显聚集,这些社区往往远离旅游业的经济效益,从而弥补了这一空白。这项研究以独特的方式量化了旅游热点地区与环境压力地区之间的空间错配,这是环境正义文献中经常忽略的一个方面。地方空间统计和累积影响分析揭示了特定地区的高贫困率和空气污染加剧之间在统计学上的显著相关性。结果显示,不同城市的模式各不相同,奥斯汀的不平等程度最低,而圣安东尼奥则表现出明显的差异。这种以社区为中心的细化方法为旅游-环境-公平之间的关系提供了新的见解,解决了在德克萨斯州快速发展的大都市地区缺乏将这些因素联系起来的全面研究的问题。研究结果强调,在诊断城市环境差异和制定考虑旅游业对当地社区影响的公平城市发展政策时,亟需采取有针对性的政策干预措施和针对具体社区的方法。
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引用次数: 0
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