cave

/keiv/

n. 洞, 穴；vi. 凹陷, 塌落；vt. 挖洞, 使凹陷, 损坏...的基础

英释：n. a geological formation consisting of an underground enclosure with access from the surface of the ground or from t...

词形：过去式 caved；过去分词 caved；现在分词 caving；三单 caves；复数 caves