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Without water, there can be no life,
沒有水就沒有生命
but its distribution over the land is far from even.
不過，水在陸地上的分配極不平均
Deserts cover one third of the land's surface and they're growing bigger every year.
沙漠覆蓋了地球表面的1/3，而且面積每年都在增大
This is the Kalahari Desert in Southern Africa.
這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.
現在是旱季，數千頭大象開始長途跋涉，不顧一切地尋找水源
All across Southern Africa animals are journeying for the same reason.
所有橫穿南部非洲的野生動物都懷有同樣的目的
Buffalo join the great trek.
非洲水牛也加入了這支浩大的隊伍
Nowhere else on Earth are so many animals on the move with the same urgent purpose.
如此之多的動物出于同一個緊急目的而進行大規模遷徙，這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.
它們的目的地是奧卡萬戈大沼澤，一片巨大的內陸三角洲
At the moment it is dry, but water is coming.
這時它仍處于旱季，可是水馬上就要來了。
The travellers are hampered by dangerous dust storms.
肆虐的沙塵暴困住了這群遷徙的動物。
