lies one of the longest, deepest and most surprising caves in the world. 存在着一座世界上最长、最深 也最令人惊奇的洞穴
cut off from the outside world and from other caves. 与外界及其它洞穴隔绝
a technique that has been used here, in Mexico, to chart the largest underwater cave in the world - 在墨西哥的这个地方 这种科技被用来 测绘世界上最大的地下水洞
Since the last Ice Age they've become cut off from the outside world. 自从上一个冰川期以来 它们便已和外界隔绝
These Bornean caves are among the biggest in the world 婆罗洲的这些洞窟是世界上最大的洞穴
Peregrine falcons and bat hawks are the jetfighters of the bird world. 游隼和蝠鹞是鸟类中的喷气式战斗机
This is the biggest underground river passage in the world, 这是世界上最大的地下河通道
One kind of rock makes this whole underground world possible - 这些地底世界之所以会存在 都是因为一种岩石
This is the biggest cave shaft in the world. 这是世界上最大的深洞