vug

例句：

1. 1. The cave was dark and damp.
   那个洞穴又黑又潮湿。
2. 2. He found a hidden cave in the mountain.
   他在山上发现了一个隐蔽的洞穴。
3. 3. The cave was filled with stalactites and stalagmites.
   洞穴里满是石笋和石柱。