cave-in cavity陷落腔
cave-in prevention塌方防治
stope cave-in采场冒落
tectonic cave-in构造塌陷
lamb cave-inlamb凹陷
cave dwellings in Qingyang庆阳窑洞民居
cave-in坍陷;塌方
cave-in possibility塌方可能性
cave-in prediction冒顶预报
treatment of cave-in坍塌处理
PHRASAL VERB（动词词组） If something such as a roof or a ceiling caves in, it collapses inward. (屋顶、天花板等) 坍塌
Part of the roof has caved in.
部分屋顶已经坍塌了。
PHRASAL VERB（动词词组） If you cave in, you suddenly stop arguing or resisting, especially when people put pressure on you to stop. 屈服; (在压力下) 突然停止争辩或反抗
After a ruinous strike, the union caved in.
在一次造成极大破坏的罢工之后，工会妥协了。