BBC听力 | 奇幻沙漠 05
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As the winds rise and fall, swirl and eddy, so they pile the sand into dunes.
随着风的起落、侵蚀和旋绕，沙子被堆成了一座座沙丘
These sand seas can be hundreds of miles across.
这些沙漠布景可宽达数百英里
In Namibia, the winds have built some of the biggest dunes in the world.
在纳米比亚，风塑造了一些世界上最大的沙丘
Star dunes like these can be 300 metres high.
这些巨型沙丘高达300多米
Grains swept up the flanks are blown off the crests of the ridges
斜坡上吹起的沙粒，在沙丘顶部的边棱处飞扬
so it's only the tops that are moving.
所以沙丘移动的部分只是顶部
The main body of these dunes may not have shifted for 5,000 years.
这些沙丘的主体可能已有5000多年未曾移动
Few rocks can resist the continuous blast of the sand-carrying wind.
岩石很难抵挡风沙持续不断的摧残
These outcrops are standing in Egypt's White Desert.
这些石头如今矗立在埃及的白色沙漠中
But they will not do so for much longer.
但它们也坚持不了多久
They are being inexorably chiselled away and turned into more sand.
它们正被无情地凿碎，变成更多的沙粒
Now lumps of heavily eroded rocks have been marooned in a sea of sand.
现在，这些严重侵蚀的石块已被放逐在沙海之中。
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