swallow-hole

英 [s'wɒləʊh'əʊl] 美 [s'wɒləʊh'əʊl]

• n. 石灰坑

英英释义

名词 swallow hole:

1. a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof