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。
Natural and man made factors make sand blown by wind environment, one of sourse regions of sand getting up on the spot during capital sand dust devil weathers, worse and worse.
潮白河流域密怀山前地区处于古北口—天竺东北信风带 ，自然和人为因素导致风沙化环境渐趋强烈 ，成为首都沙尘暴天气中就地起沙的源区之一。
The wind causes much wearing of rocks, particularly if sand and dust are blown along by it.
风引起岩石磨耗，尤其是当风沙很大时。
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