1. 山洞;洞穴 A cave is a large hole in the side of a cliff or hill, or one that is under the ground.
e.g. ...a cave more than 1,000 feet deep. 1,000多英尺深的山洞
相关词组：cave in
名词洞穴；山洞动词在…挖洞；使陷下；使倒坍；使崩溃int.〈英俚〉小心网络窑洞；地窖；岩洞
