大约3.48亿公顷森林用于保持水土资源，控制雪崩和荒漠化，稳定沙丘和保护沿海地区。

Around 348 million hectares of forests are used to conserve soil and water, control avalanches and desertification, stabilize sand dunes and protect coastal areas.

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将沙丘背风坡的稳定性问题等价于一个双参变量函数的待定边界的泛函极值问题。

The problem of the lee slope stability of dune is equivalent to the extremal problem of a functional of two-variant function with a variable boundary in this paper.

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这一突然的改变使沙丘变得不稳定并引发雪崩。

This sudden shift destabilises the dunes and triggers avalanches.

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