该地区也是拉丁美洲最大的地下洞穴和湖泊系统之一。

The area is also home to one of the largest underground ___cave and lake systems in Latin America.

第二天我去看了一个里面有蓝色湖泊的洞穴。

The next day I went to see a ___cave with a blue lake inside it.

我们在徒步旅行中发现了一个古老的洞穴。

We discovered an ancient ___cave during our hike.