词典释义：
释义
n.
a cave, or a chamber in a cave, typically a large one
（尤指大的）洞穴，山洞；（洞穴的）深凹处，深处。
used in similes and comparisons to refer to a vast, dark space
大而黑之处（用于比喻、比较中）
-
a dark cavern of a shop .一家像一个黑沉沉的山洞似的商店。
词源
"late Middle English： from Old French