沙漠化灾害是在特定自然环境背景下产生的，严重危及人类生产和生存。
Desertification disaster is caused by particular natural environment. It hazards seriously human "s produce and living."
若是人工造景，选用朴素简单的背景墙或背景纸；若是自然环境下，你可以任意取材，但要确保简单朴素！
If creating your own droplets, use a plain wall or a sheet of paper as a backdrop, if in a natural setting, use whatever is around you, but keep it simple!
本文分别从自然环境、社会经济背景和文化背景介绍了景区概况。
It is introduced from the natural environment, socio-economic background and cultural backgrounds.
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