The social and economic characteristics in pastoral area are small population density and great contradiction between forestry and animal husbandry.
牧区（风沙区）具有人口密度小，林牧矛盾突出的特点。
Three characteristics of fictitious society have been exerting more and more pressure to modern human economic and social living.
虚拟社会表现出来的三大特征对现代人类经济与社会生活实践发挥着越来越大的影响。
The causes of land degradation not only include the natural factors, such as the characteristics of land resources and the natural environment, but also the social and economic factors.
产生土地退化的原因，不仅仅是土地资源特点与自然环境这样一些自然因素，还包括一些社会与经济因素。
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