wellhole
'welhəʊl
基本解释
井道; 井底水仓; 垂直大炮眼; 井筒
英文释义
n. The open space in a floor, to accommodate a staircase.
n. The open space left beyond the ends of the steps of a
staircase.
n. A cavity which receives a counterbalancing weight in
certain mechanical contrivances, and is adapted also for other
purposes.
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