deep buried infilled cave 深埋充填溶洞
So brave was the little boy that he dared go into the deep cave alone without any help.
这个小男孩是那么勇敢，他敢在没有任何帮助的情况下一个人走进深洞。
The rocks were surfaced from the deep cave.
从深洞里挖出的岩石被送到了地面。
For example, although all of Fallingwater is opened by broad bands of Windows, people inside are sheltered as in a deep cave, secure in the sense of hill behind them.
例如，尽管整个流水别墅都开了很多大窗子，人们在屋里就像呆在一个深深的山洞中一样，仿佛背靠着一座山，感觉很安全。
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