People have planted a great many trees in order to hold back wind and sand in the desert.

为了阻挡沙漠中的风沙，人们种了很多树。

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Sediment as you know, is material like sand, gravel, fossil fragments that is transported by natural processes like wind, water flow or the movement of glaciers.

如你所知，沉积物是通过风、水流或冰川运动等自然过程输送的物质，如沙子、砾石、化石碎片等。

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Wherever the wind dropped sand, dunes formed.

VOA: special.2010.01.04

Dune: accumulations of wind-blown sand in ridges or mounds that lie landward of the beach and usually parallel to the shoreline.

UNESCO: L O S S A R Y

The trees, donated by members of the public, will help to slow the wind, cause sand to be deposited and allow the shrinking dunes to grow.

BBC: Fylde sand dune restoration boosted by Defra funding

When the wind from the west meets the wind from the east, the sand is pushed upward like the ocean waves the dunes resemble.

CNN: Romancing the dune in Namibia