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 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。
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