美東公共交通發達，是因為當初它發展的時候，汽車工業還很弱小。會有比人手一車更降低效率，增加汙染的嗎？

來源: Luckyd 於 2016-01-31 19:03:07 [舊帖] [給我悄悄話] 本文已被閱讀：次

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