U型管+水的設計就是用來阻隔氣味的，你看了視頻及旁邊的說明嗎？其中有一句：

來源: 於 2023-10-20 14:40:01 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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