it

2731 篇文章
It was Lechuguilla's gypsum crystals
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It was Lechuguilla's gypsum crystals 龙舌兰洞的石膏结晶群

It mixes with oxygen and the water,
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It mixes with oxygen and the water, 与水中的氧发生化合反应

it can't afford to miss it.
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it can't afford to miss it. 它绝对不会放过

that one would not expect it to contain any life whatsoever.
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that one would not expect it to contain any life whatsoever. 不管什么生物似乎都不可能在那里生存

External gills help it to breathe in water that is particularly low in oxygen.
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External gills help it to breathe in water that is particularly low in oxygen. 外生的鳃帮助它们 在极度缺氧的水中呼吸

It takes thousands of generations for eyes to be lost,
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It takes thousands of generations for eyes to be lost, 眼睛的退化需要经历数千代的演变

making it a particularly difficult place for animals to live.
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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,
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Yet some have managed it, 但有些动物却能在此生存

all 100 miles of it.
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all 100 miles of it. 全长达100多英里

It becomes their lifeline -
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It becomes their lifeline - 这成了它们的救生索