manhole

manhole汉语翻译：
n. 人孔
【化】 人孔; 进人孔英语解释：
名词 manhole:

a hole (usually with a flush cover) through which a person can gain access to an underground structure

详细解释：
man.hole
n.（名词）
A hole, usually with a cover, through which a person may enter a sewer, boiler, drain, or similar structure.
下水道出入孔：一种常带有盖的孔道，人可以由此孔进出排道、锅炉、下水管或类似设施