1. The cavern was found by accident.
    这个洞穴是偶然发现的。

2. Squeezing through a cleft in the rocks, the pot-holers arrived at an enormous cavern, the size of a huge concert hall.
    洞穴探险者从岩石缝里挤身过去，来到一个巨大的洞里，其大小相当于一个音乐厅。

3. In the eerie silence of the cavern,
    洞里有一种可怕的寂静，