watertight manhole的意思|示意
美 / /
英 / /
水密人孔（下水道供人出入的孔）
watertight manhole相关短语
1、 watertight manhole covers 水密人孔盖
2、 raised watertight manhole 升高水密人孔
watertight manhole相关例句
Oil or water tanks shall have oil tight or watertight manhole covers.
油柜或水柜应该有相应的油密或水密人孔盖.
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