cave
单词辨析：
普通用词，泛指固体物中的空间或某物可穿过的空间。
There was a small hole in the road.
路上有个小坑。
The explosion tore a hole in the wall.
墙被炸出一个洞。
A mole dug a hole near the wall.
鼹鼠在墙边打了一个洞。
表示某物上有个洞，不要用 on, 而要用 in。
指较大的天然洞窟，如山洞、岩洞等，也可指人造的窑洞。
The cliffs are riddled with caves.
岩壁上布满洞穴。
The entry of the cave was hidden by trees.
洞穴的入口被树丛遮掩。
比 hole 正式，指实体内或表面的空洞或空腔。
That is actually a cavity in the earth.
那其实是一个地下洞穴。
There is a cavity in one of my teeth.
我的一颗牙齿上有个蛀洞。
The heart is located roughly in the center of the chest cavity.
心脏大致位于胸腔的中央。
指较小的、吸引人的洞穴、岩穴、石窟等，可以是天然的，也可以是人工开凿的。
The grotto is not accessible at present.
该石窟目前不可进入。
He found a beautiful grotto, whose entrance was hidden by vines.
他发现了一个漂亮的洞穴，入口被藤蔓遮掩着。
相关例句：
The earthquake made the roadbed cave in.
地震后路基沉陷了。
The roof of the cave dropped in on the miners, trapping them.
窑洞的顶部坍了下来，砸在矿工身上。
It's all darkness in the cave.
山洞里一片黑暗。
The roof is dangerous and could cave in at any time.
屋顶很危险，任何时候都可能坍塌。
They picked a cave for their night camp.
他们选了一个山洞作为过夜的营地。
King Arthur hid his treasures here and Merlin enchanted the cave so that nobody should ever find them.
亚瑟王将他的财宝藏在这里，墨林对洞穴施了魔法，这样永远不会有人找到那些财宝。