He had always wanted to go caving .他过去一直想探索洞穴。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.The positively charged AlCl _ 2 - MMH - bentonite mud system possesses more powerful ...

n.崩落开采法，垮落，放顶，窟窿...

caving的音标：caving的英式发音音标为：['keɪvɪŋ]caving的美式发音音标为：[]...