(或cave something in)(with reference to a roof or similar structure) subside or collapse or cause something to do this (屋顶等)下陷,坍塌,倒塌;使下陷,使倒塌
英语六级真题
Stored underground in large salt caves in Louisiana, this stockpile is called the Strategic Petroleum Reserve, and currently contains over 600 million barrels of oil, roughly equivalent to one month's supply.
出自-2013年6月阅读原文
As a measure to counter future shortages, the American government decided to establish a stockpile of oil in caves underground
出自-2013年6月阅读原文
柯林斯高阶英汉双解学习词典释义
N-COUNT
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.