纪录片《我们的地球》 第74期 洞穴迷宫(13)

The tighter the squeeze, the greater the chance of damaging some vital life-support system.

“瓶颈”越是狭窄，便越有可能损坏一些重要的生存设备。

In these conditions, a diver could easily become disorientated, and that could be fatal.

在这种情况下，潜水员很容易迷失方向，而这将导致送命。

The flooded caverns¹ can play tricks on you in other ways.

地下水洞还会以别的方式戏弄你

What seems like air isn't. It's just another kind of water.

这看上去像是空气不对。它只是另一种水。

This is a halocline, a meeting of fresh and salt water.

这里是盐跃层，淡水与咸水的交汇处。

Fresh water from the jungle flows over the heavier salt water from the sea.

咸水来自海洋，比重较重，来自丛林的淡水在其上方流动。

The salt water layer is extremely low in oxygen,

咸水层的含氧量很低

making it a particularly difficult place for animals to live.

对动物而言是极为困难的生境

Yet some have managed it, like the remipede, one of the most ancient of all living crustaceans².

但有些动物却能在此生存，例如桨足虫--一种最古老的甲壳动物。

1 caverns   

大山洞，大洞穴( cavern的名词复数 )

参考例句：

• Within were dark caverns; what was inside them, no one could see. 里面是一个黑洞，这里面有什么东西，谁也望不见。 来自汉英文学 - 家（1-26） - 家（1-26）
• UNDERGROUND Under water grottos, caverns Filled with apes That eat figs. 在水帘洞里，挤满了猿争吃无花果。

2 crustaceans   

n.甲壳纲动物（如蟹、龙虾）( crustacean的名词复数 )

参考例句：

• These crustaceans provide a valuable food source for some fish. 这些甲壳纲动物是某些鱼类重要的食物来源。 来自《简明英汉词典》
• When the tide ebbs it's a rock pool inhabited by crustaceans. 退潮时，它便成为甲壳动物居住的岩石区潮水潭。 来自辞典例句