BBC听力 | 从南极到北极 16
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Without water, there can be no life,
没有水就没有生命
but its distribution over the land is far from even.
不过，水在陆地上的分配极不平均
Deserts cover one third of the land's surface and they're growing bigger every year.
沙漠覆盖了地球表面的1/3，而且面积每年都在增大
This is the Kalahari Desert in Southern Africa.
这里是南部非洲的卡拉哈里沙漠
It's the dry season and thousands of elephants have started to travel in desperate search for water.
现在是旱季，数千头大象开始长途跋涉，不顾一切地寻找水源
All across Southern Africa animals are journeying for the same reason.
所有横穿南部非洲的野生动物都怀有同样的目的
Buffalo join the great trek.
非洲水牛也加入了这支浩大的队伍
Nowhere else on Earth are so many animals on the move with the same urgent purpose.
如此之多的动物出于同一个紧急目的而进行大规模迁徙，这在地球上其它地方可看不到
They're all heading for the swamps of the Okavango, a vast inland delta.
它们的目的地是奥卡万戈大沼泽，一片巨大的内陆三角洲
At the moment it is dry, but water is coming.
这时它仍处于旱季，可是水马上就要来了。
The travellers are hampered by dangerous dust storms.
肆虐的沙尘暴困住了这群迁徙的动物。
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