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With no plants to bind them, thin soils soon turn to dust and blow away.
沒有植被固定土壤，稀薄的土層很快就會變成沙塵，被風吹走。
Now, these barren lands are left to the mercy of the elements.
如今，這片不毛之地只能任由自然力量擺布。
Scorched by the sun and scoured by windblown sand,
烈日炙烤加之風沙侵襲，
desert rock is shaped into strange, otherworldly landscapes.
沙漠巖石形成了奇異非凡的景致。
These rocky deserts may have a beguiling beauty,
這片巖質沙漠或許看似美好，
but when they become this barren, very little life can endure.
但這里如此荒蕪，極少生物能夠適應。
For many animals, the only way to survive the most hostile times is to keep moving.
動物們想要在最嚴苛的環境里活下來就必須不斷遷移。
In the Kalahari, brief rains have given way to the dry season.
喀拉哈里沙漠短暫的雨季已被旱季替代。
Food and water are becoming increasingly scarce.
食物和水愈發稀缺。
For these zebra, it's time to leave.
這群斑馬是時候離開了。
They're setting off on the longest overland migration made by any mammal in Africa,
斑馬的遷移距離稱霸所有非洲哺乳動物，
marching towards the scent of distant rains.
嗅著遠方雨水的味道不斷前進。
