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: 于 2023-10-20 14:40:01 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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