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单词 pit-prop
释义

pit-prop

美 
英 
  • na.矿井中用的临时木支柱
  • 网络坑柱
Pit-prop
n.
1.
(煤矿的)木支架,坑木,坑柱a large piece of wood used to support the roof of part of a coal mine from which coal has been removed

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更新时间:2024/11/15 22:30:04