caving without specific props

例句：

1. 1. 洞穴探险；2. 潜行；3. 挖掘；4.
   在洞穴或地下
2. 1. The cavern is home to a variety of insects.
   这个洞穴里生活着各种各样的昆虫。
3. 2. The team decided to descend into the cave for further exploration.
   团队决定下去洞穴进行进一步的探索。
4. 3.She was able to tunnel through the rock with her bare hands.
   她用双手挖通了岩石。