pit prop
noun /ˈpɪt prɒp/
/ˈpɪt prɑːp/
- a large piece of wood used to support the roof of part of a coal mine from which coal has been removed
单词 | pit prop |
释义 | pit propnoun /ˈpɪt prɒp/ /ˈpɪt prɑːp/
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