n.(下水道等供人出入的)出入孔；人孔

Someone is working in the manhole. 有人在（鍋爐的）檢修孔中工作。

I need to find a manhole tool... 我需要找個通道蓋子工具...

Here's the question: Why are manhole cover的復數(shù)或三人稱單數(shù)。" target="_blank">covers round? 這個問題是：為什么下水道井蓋都是圓的?

Or the manhole cover outside your apartment? 還是你公寓外面的下水井蓋?

Why are manhole cover round in shape? 點解下水道的蓋是圓形的?

Please move the manhole cover away. 請將人孔蓋移開。