山洞

例句：

1. 1.The explorers found a cave with a hidden treasure.
   探险者们发现了一个藏有宝藏的洞穴。
2. 2.The children played in the crevice of the mountain.
   孩子们在山中的缝隙里玩耍。
3. 3. The cave is too narrow for us to pass through.
   这个洞穴太窄，我们无法通过。