N-COUNT (位于街面,盖有金属盖,供工人检修、疏浚下水道时出入的)出入孔,检修孔,人孔 A manhole is a large hole in a road or path, covered by a metal plate that can be removed. Workers climb down through manholes when they want to examine or clean the drains. (位于街面,盖有金属盖,供工人检修、疏浚下水道时出入的)出入孔,检修孔,人孔