The source of these toxic fumes lies several miles below. 这些毒气的源头位于地下几英里处
It's astonishing that these extraordinary cave dwellers manage to survive at all. 这些奇异的洞栖生物能如此成功地生存 的确令人称奇
so these species must have been isolated for a very long time. 所以这些物种必定 与世隔绝了相当长的一段时间
The entire population of these cave angel fish 世界上所有的洞穴天使鱼
This is the price that these cave commuters must pay 这是洞栖动物必须付出的代价
A bottleneck funnels these exiting bats into dense concentrations 当大群蝙蝠密集地通过瓶颈出口时
For these fish the caves are a night time retreat, 对于这些鱼来说 洞穴是理想的过夜场所
but they could never have known that these flooded passageways were actually the beginning of subterranean rivers, 但他们从不知道这些水下通道 其实是地下河的入口
In these conditions a diver could easily become disorientated 在这种情况下 潜水员很容易迷失方向