城市的“集聚经济”与“集聚不经济”如何权衡？
How are urban "agglomeration economies" and "diseconomies" balanced?
集聚带来分工、知识外溢与低成本匹配，提升生产率；过度集聚则推高地价、通勤与污染，降低宜居度。城市规模的最优在于两者边际相等处。
Agglomeration brings division of labor, knowledge spillovers, and cheap matching that boost productivity; excess raises land prices, commuting, and pollution, hurting livability. The optimal city size is where their margins equalize.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Anthony Giddens,《Sociology》Polity Press 多版;中译《社会学》北京大学出版社
A. Giddens, Sociology, Polity Press, various editions; Chinese ed. Peking University Press
#集聚经济 #外部性
为什么城市中心的气温往往高于周边郊区？
Why are city centers usually warmer than surrounding suburbs?
城市因混凝土、少植被和人为散热，气温常高于周边乡村，这称为“城市热岛效应”，夏季更明显；它加剧用电高峰与健康风险，尤其影响弱势社区。
Cities run hotter than surrounding countryside due to concrete, less vegetation, and human heat—the “urban heat island” effect, peaking in summer; it spikes power demand and health risks, hitting vulnerable neighborhoods hardest.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Anthony Giddens,《Sociology》Polity Press 多版;中译《社会学》北京大学出版社
A. Giddens, Sociology, Polity Press, various editions; Chinese ed. Peking University Press
#热岛效应 #城市
快速城市化会带来哪些压力？
What pressures does rapid urbanization bring?
城市扩张常超出住房、交通、供水和垃圾处理等设施的承载能力，导致拥挤、贫民窟、污染与公共服务紧张。
Rapid urban growth often outpaces housing, transport, water, and waste systems, causing congestion, slums, pollution, and strained public services.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Anthony Giddens,《Sociology》Polity Press 多版;中译《社会学》北京大学出版社
A. Giddens, Sociology, Polity Press, various editions; Chinese ed. Peking University Press
#城市化 #承载力