- main roof caving
- 老顶垮落
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
main roof caving
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cave-in — ˈ ̷ ̷ˌ ̷ ̷ noun ( s) 1. : the action of caving in : cave VI 2. : a place where earth has caved in * * * /kayv in /, n. 1. a collapse, as of anything hollow: the worst cave in in the history of mining. 2 … Useful english dictionary
