cave 最常见的用法是作名词用，意为“山洞，洞穴”，例如：
She took me by the hand and led me into the cave.
她拉着我的手，领我进了山洞。
cave 也可以作动词，常用在短语动词 cave in 中，表示：
1、to fall for something, either literally or metaphorically
爱上某事，无论是字面上的还是隐喻的
2、to succumb to (pressure) 屈服于（压力）
3、to collapse 坍塌
4、admit defeat 承认失败
例如：
1、The building caved in by itself after being erect for almost 70 years.
建了将近70年后，这座建筑物在自然倒塌了。
解析：after 引导的时间状语从句，状语从句的主语和主句的主语一致，可省略状语从句的主语和 be 动词。
2、The ceiling suddenly caved in on top of them.
天花板突然塌落在他们身上。
3、I travelled on the flyover yesterday and it is in the news today for caving in.
我昨天上了天桥，今天的新闻里有关于塌方的报道。
4、She caved in to the offer way too early which is why she got the raw end of the deal.
在报价上她过早让步，这就是她最终得到这笔交易的原因。
解析：way 作副词时，意为“很远，大量”，经常跟介词或副词连用。
5、I caved in to my diet on the second day.
我在第二天就放弃了节食。
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