风沙化土地既是可利用的土地资源，又是环境污染的物质源地。
The wind-drift sand land is both an available land resource and a source of pollutants of environmental pollution.
芦笋既具有适应风沙化土地生态系统特点的生物学特征，又具有很好的经济价值。
Asparagus not only has high economic and nutritional value, but also has it biological characteristic of adapting to the ecosystem of wind-sandy wasteland.
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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