3-7-3第1段和第2段

Since the late 1960s,ecologists have developed mathematical and other models that simulate ecosystems.Computer simulations can help scientists understand large and very complex systems(such as rivers,oceans,forests,grasslands,cites,and climates)
that cannot be adequately studied and modeled in field and laboratory research.Scientists are learning a lot about how the earth works by feeding date into increasingly sophisticated model of the earth's systems and running them on supercomputers.
Researchers can charge values of the variables in their computer models to project possible changes in environmental conditions,help anticipate environmental surprises,and analyze the effectiveness of various alternative solutions to environmental problems.








自1960年代末期以來，生態學家和其他發達國家的數學模型，模擬生態系統。計算機模擬可以幫助科學家了解大和非常複雜的系統（如河流，海洋，森林，草原，瀕危物種和氣候)不能得到充分的研究和模仿的實地和實驗室研究。科學家們學習了很多關於如何地球作品餵養日期到日益複雜的模型，地球的制度和運行他們的超級計算機。
研究人員可以收取價值的變量在其計算機模型項目中可能出現的變化的環境條件，幫助預測環境驚喜，並分析了效益的各種替代方案的環境問題。