什么是“摊大饼式”城市扩张，问题在哪？
What is “pancake-style” urban sprawl and what’s wrong with it?
指城市以中心向外无序连绵蔓延，摊大饼式扩张拉长通勤、占用耕地、削弱公共交通效率。紧凑多中心规划被视为更可持续的替代。
It means cities spread outward from the center in continuous, disorderly sprawl, lengthening commutes, eating farmland, and weakening transit efficiency. Compact, multi-center planning is the greener alternative.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fujita, Krugman & Venables,《The Spatial Economy: Cities, Regions, and International Trade》(MIT Press, 1999)
Fujita, Krugman & Venables, The Spatial Economy: Cities, Regions, and International Trade (MIT Press, 1999)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780262303606 (1999)
#城市扩张 #规划 #通勤
为什么“公交优先”被认为能缓解堵车？
Why is “bus priority” believed to ease congestion?
公交车单人运能远高于私家车，设专用道与信号优先可提升人均通行效率、鼓励公交出行，从而减少道路车辆总数。
Buses move far more people per vehicle than cars; dedicated lanes and signal priority raise per-capita throughput and encourage transit use, cutting total cars on the road.
难度 专业 · 适合 初中(12-15)
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
#公交优先 #拥堵 #效率
为什么很多城市中心“白天热闹、晚上空荡”？
Why are many city centers busy by day but empty at night?
这是“职住分离”的结果：人们白天到中心上班、晚上回郊区居住，形成昼夜人口落差。它影响商业时段、治安与夜间活力。
This is “job-housing separation”: people work downtown by day and sleep in suburbs at night, creating a day-night population swing. It shapes business hours, safety, and nightlife vitality.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Fujita, Krugman & Venables,《The Spatial Economy: Cities, Regions, and International Trade》(MIT Press, 1999)
Fujita, Krugman & Venables, The Spatial Economy: Cities, Regions, and International Trade (MIT Press, 1999)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780262303606 (1999)
#职住分离 #城市 #昼夜
为什么红绿灯要用红黄绿三色？
Why do traffic lights use red, yellow, and green?
红色波长最长、最醒目且历史上与“停止”关联；绿色代表通行，黄灯作过渡警示。三色约定俗成成为全球通用信号。
Red has the longest wavelength and historic link to “stop”; green means go, yellow warns of transition. The three colors became a global convention.
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
#红绿灯 #交通 #信号