Traditional evaluation method of national economy is to make a decision at one time by the net present value, without considering the influence induced by the change of project environments.

传统的国民经济评价方法一般是根据净现值的大小一次做出决策，不考虑项目的内外部环境的变化对项目的影响。

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Objective:To probe the mechanism that artifical environments wind cold dampness(WCD) and wind dampness hot(WDH) affect the development of collagen induced arthritis(CIA) in rats.

目的探讨人工风寒湿与风湿热环境影响大鼠胶原诱导性关节炎（CIA）发病的机理。

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It is the phenomenon that concrete structures in salted contaminated environments suffer premature deterioration from chloride induced reinforcing corrosion.

盐污染环境中由于氯化物引起钢筋腐蚀导致钢筋混凝土结构过早破坏，是世界上普遍存在的现象。

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