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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