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 cover的复数或三人称单数。" target="_blank">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。
