n.(下水道等供人出入的)出入孔；人孔

Someone is working in the manhole. 有人在（锅炉的）检修孔中工作。

I need to find a manhole tool... 我需要找个通道盖子工具...

Here's the question: Why are manhole covers round? 这个问题是：为什么下水道井盖都是圆的?

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

Why are manhole cover round in shape? 点解下水道的盖是圆形的?

Please move the manhole cover away. 请将人孔盖移开。