井壁坍塌物
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同义词： cave in subsidence
同义词： collapse fall in cave in give give way break founder
以上来源于: WordNet
N-COUNT A cave-in is the sudden collapse of the roof of a cave or mine. 坍塌
Many mines devote little attention to safety standards, resulting in frequent cave-ins, explosions, floods and fires.
许多矿井对安全标准不重视，塌方、炸、水和火灾频繁发生。
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