人口多還是難免物理上的局促，比如日本東京和中國一線城市地鐵。這個靠教育民眾無法解決。

來源: a7a8 於 2023-02-21 10:42:40 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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