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As the winds rise and fall, swirl and eddy, so they pile the sand into dunes.
隨著風(fēng)的起落、侵蝕和旋繞，沙子被堆成了一座座沙丘
These sand seas can be hundreds of miles across.
這些沙漠布景可寬達(dá)數(shù)百英里
In Namibia, the winds have built some of the biggest dunes in the world.
在納米比亞，風(fēng)塑造了一些世界上最大的沙丘
Star dunes like these can be 300 metres high.
這些巨型沙丘高達(dá)300多米
Grains swept up the flanks are blown off the crests of the ridges
斜坡上吹起的沙粒，在沙丘頂部的邊棱處飛揚(yáng)
so it's only the tops that are moving.
所以沙丘移動的部分只是頂部
The main body of these dunes may not have shifted for 5,000 years.
這些沙丘的主體可能已有5000多年未曾移動
Few rocks can resist the continuous blast of the sand-carrying wind.
巖石很難抵擋風(fēng)沙持續(xù)不斷的摧殘
These outcrops are standing in Egypt's White Desert.
這些石頭如今矗立在埃及的白色沙漠中
But they will not do so for much longer.
但它們也堅(jiān)持不了多久
They are being inexorably chiselled away and turned into more sand.
它們正被無情地鑿碎，變成更多的沙粒
Now lumps of heavily eroded rocks have been marooned in a sea of sand.
現(xiàn)在，這些嚴(yán)重侵蝕的石塊已被放逐在沙海之中。
