it

2731 篇文章
The cold water cools the moist warm air above it
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The cold water cools the moist warm air above it 冷水使得上方的暖湿气流冷却

They get it partly from cactus flowers
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They get it partly from cactus flowers 其中一部分水取自仙人掌花

As the saliva dries it has to be replaced
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As the saliva dries it has to be replaced 唾液干了之后还得重新抹上

The Gobi, hostile though it is, is their last stronghold.
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The Gobi, hostile though it is, is their last stronghold. 戈壁尽管环境险恶 却是它们最后的据点

It evaporates.
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It evaporates. 它们升华了

But it is the only source of water,
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But it is the only source of water, 可是这是唯一的水源

so Bactrian camels eat it.
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so Bactrian camels eat it. 所以双峰驼只能吃雪

The air is just too cold and too dry for it to do so.
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The air is just too cold and too dry for it to do so. 又冷又干的空气使它们无法解冻

The sun's rays turn it straight into vapour.
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The sun's rays turn it straight into vapour. 阳光把它们直接变成了水蒸气

it leaves behind gypsum,
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it leaves behind gypsum, 也留下了石膏