“洞穴”用英语怎么说？

“洞穴”的近义词/同义词：窟窿, 穴洞, 洞窟。...

他们试着在洞穴正下方的一块地上挖掘。They tried digging in a patch just below the cave.这正是洞穴探险者害怕的那种洪水。This is the type of flood dreaded by cavers.那些洞穴深约18公里。The caves extend for some 18 kilo-metres....

“洞穴”的拼音为：dòng xué...