| 单词 | cave in (on sb/sth) | 
| 释义 | ● ˌcave ˈin (on sb /sth )(of a roof , wall , etc .房顶、墙等) to fall down and towards the centre 塌落;塌陷;坍塌◆ The ceiling suddenly caved in on top of them . 他们头顶的天花板突然塌落。 ➡ related noun cave-inSee also cave | 
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