供水靠水压，sewage大多靠重力。在山坡起伏的郊区，哪怕近郊也只能用化粪池。

来源: 柠檬椰子汁于 2022-10-21 19:22:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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