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.
2
北京的春季短且多风沙，温度适中并不冷，穿一件薄毛衣和一条绒裤即可。
Spring in Beijing is short and mild, but with strong winds that can blow gusts of sand and dirt. A light sweater and jacket would suffice.
3
通过对北京市永定河流域气候、地质条件及人为活动的调查，分析了永定河流域风沙化土地的成因。
Through the investigation on climate, geological condition and human activity of Yongding River Basin, the origin of wind-sandy land in Yongding River Basin was analyzed.
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