撒哈拉沙漠是一个沙质沙漠，有很多沙丘。

The Sahara is a sandy desert with great sand hills.

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有些沙漠是沙质和石质的。

Some deserts are sandy and stony.

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乌兰布和沙漠是我国八大沙漠之一，处于我国北方半干旱与干旱区的转折位置上，进一步沙质荒漠化的潜在危险性。

Ulanbuhe desert is one of the eight largest deserts in China. It is located on the transitional zone between semi-drought and drought area, and could be easily desertified further.

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