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Wild Bactrian camels, one of the rarest mammals on the planet, and perhaps the hardiest.
野雙峰駝，一種地球上最稀有的哺乳動物，可能也是最堅韌的動物。
Their biggest problem is the lack of water,
它們最大的困難莫過于缺水
particularly now in winter when the little there is is locked up as ice.
尤其是現在--冬天，那里僅有的一點水也結成了冰。
Surprisingly, snow here never melts. The air is just too cold and too dry for it to do so.
奇怪的是，這里的雪永遠都不會融化。又冷又干的空氣使它們無法解凍。
The sun's rays turn it straight into vapour. It evaporates.
陽光把它們直接變成了水蒸氣。它們升華了。
But it is the only source of water, so Bactrian camels eat it.
可是這是唯一的水源，所以雙峰駝只能吃雪。
Elsewhere in the world, a camel at a waterhole can drink as much as 200 litres during a single visit.
在世界上其它地方，一只駱駝找到水坑后，能一次喝下200升水。
Here, the strategy is to take little and often, and with good reason for filling the stomach with snow could be fatal.
但在這里的飲水策略卻是少而頻繁，這當然有充分的理由，因為肚子里裝滿雪將是致命的。
The camels must limit themselves to the equivalent of just 10 litres a day.
駱駝必須限定自己每天只能吃10升左右的雪。
