Yongding River sand land is the largest area of wind-sand land sand and is one of the most severe wind sand damage region in Beijing, Which has important influence to eco-entironment in Beijng.

永定河沙地是北京市面积最大的风沙化土地和风沙危害最严重的地区之一，对北京市的生态环境有重要影响。

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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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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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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