摘 要: | At the beginning of the 21st century, the world is facing too many natural and artificial disasters, and man is also facing various decisions difficult to be made. The evidence for the earth warming-up is more clear year by year and natural disaster occurs frequently and economic loss in miserable situation, moreover, the evil consequence from the lose of control technologically, overage development is more serious year after year and the daily ecological envi-ronment of man is trending toward…
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