After a dry period, the first rain running down the tree bark contains most nutrients, dissolved from wind-blown dust and organic matter.

经过一个干季，第一次雨沿着树干降落下来，带着尘土和有机物的机体。

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This series of images, derived from a computer model, shows wind-blown dust from North Africa as it spread over the Atlantic Ocean on July 1, 2009.

这组电脑模拟的系列图片展示了南非扬起的尘土在2009年6月1日席卷大西洋的情景。

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We travelled north to Tillaberi, a rolling landscape of sand, wind-blown dust, and sparsely scattered bushes and trees, seemingly in the very last stages of desiccation.

我们一直向北到了提拉贝里，那里是一片荒凉—飞沙，飞尘还有稀疏的树木，看起来也即将要干枯了。

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