当我着手写这篇序言的时候，窗外阳春三月的北京，正在遭受着十多年来最严重的一次沙尘暴的袭击，漫天的风沙把天空染成浓重的桔黄色，空气中弥漫着刺鼻的土腥味。逐年加重的沙尘暴引起我们深刻的反思：沙尘暴的形成固然有多方面的原因，但人与自然之间的矛盾加剧，是其中最重 As I proceeded to write this preface, the window of Beijing in spring March was under the strongest dust storms in more than a decade. The sky was stained with orange-red sky, the air was filled with pungent The smell of soil. Dust storms that have been aggravating year after year have caused us deep reflection: There are many reasons for the formation of dust storms, but the contradiction between man and nature is the heaviest