U型管+水的设计就是用来阻隔气味的，你看了视频及旁边的说明吗？其中有一句：

来源: 鲤鱼洲 于 2023-10-20 14:40:01 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (277 bytes)

If you smell a funny stench or odor coming from your floor drain, it's very likely your P-trap is dry.

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