caving是什么意思？

caving

英[ˈkeɪvɪŋ]

• n. 崩落开采法，垮落，放顶，窟窿；

例句

• The positively charged AlCl _ 2 - MMH - bentonite mud system possesses more powerful anti - caving capacity. AlCl_3-MMH-膨润土体系可成为防塌作用更强的正电泥浆.
• With the roof caving in, there were an increasing number of desertions. 由于大势已去, 逃兵的人数日益增多.
• He had always wanted to go caving . 他过去一直想探索洞穴。

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.
  例句
  ...a cave more than 1,000 feet deep. 1,000多英尺深的山洞