drain是引流管，drainage是引流的意思吧。查到的：

來源: 妖妖靈 於 2022-08-17 07:26:51 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (950 bytes)

Drain: A channel or pipe carrying off surplus liquid, esp.rainwater or liquid waste. Drainage: The means of removing surplus water or liquid waste; a system of drains.

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