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In fact, most small desert creatures are nocturnal.
事實上，大多數小型沙漠動物都是夜行動物
So it's only now that you can judge just how much life there can be in a desert.
所以只有此時你才能判斷沙漠中究竟有多少生物
But moisture lost, even at night, has to be replaced sometime, somehow.
可是水分在晚上也會損耗，必須在什么時候想辦法補充
And that problem dominates the lives of all desert dwellers.
這一問題支配著所有沙漠動物的生活
The Atacama in Chile. This is the driest desert in the world.
智利的阿塔卡馬沙漠，這里是世界上最干旱的沙漠。
Some parts may not see rain for 50 years, and with such a record,
有的地方可能連續5年不會下一滴雨，既然有了這一紀錄，
you would expect the place to be completely barren.
不難想象這個地方定是徹底的荒蕪。
These are South America's camels, guanacos.
這些是南美洲的駱駝——原駝
They are very good at conserving moisture, but they, nonetheless, need a regular supply of water.
它們非常善于保存水分，但它們仍須定期補充水。
They get it partly from cactus flowers.
其中一部分水取自仙人掌花
But that explanation raises another question.
但這里又牽扯出另一個問題
How do the cacti survive without rain?
仙人掌為何能在這個無雨地帶生存
Hot winds suck all the moisture from the surface of the land.
熱浪抽干了地面上所有的水分
Clearly, there must be something else that takes the place of rain.
顯然，這里必須有其它東西能代替雨水的作用
The secret is a cold sea current that runs parallel to the land.
答案就是一股與陸地平行的寒冷洋流
The cold water cools the moist, warm air above it and that produces banks of fog.
冷水使得上方的暖濕氣流冷卻形成一團團的霧霾。
