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rs reac h their gate s on ti me. c. 將問題分階段考慮 例 3 : We divide the jum p into th ree phases : flying thro ug h th e air, pu nc hing th rou gh t he stac k, a nd l an ding o n the gr ound. 第二 段:具體分析 1 .在什么模型中 / 建立了什么模型 a. 主流模型 例 1 : W e f ormula te a dif fer entia l m od el to ac cou nt f or the rat es of chang e of t he se uses , a nd how th is chang e would af fec t the ov era ll co nsumptio n of wate r within t he st ud ie d region. 例 2 : Base d on (writ e your basis .s uch as the theory of supply and dem and ), we e st ablis h a m od el (su ch as diffe renti al equ at io n sy st em that includes dem and , s uppl y) . 例 3 : To ( write the a im s) , we e st ablis h a c rit eri on (writ e the cri te rion) b. 模型非主流 例 4 : W e b uild a m od el to de te rmi ne h ow to la y out the pipe e ach t ime the e quipme nt i s moved. 例 5 : W e dete rmi ne …… …… 例 6 : W e build a m ode l to det er mine ………. 2 .分析模型(使用什么數(shù)據(jù),怎么做,一般三句話) a. 寫歷史數(shù)據(jù) 例 1 : Using histor ical data from the U nited Stat es, we det e rmine initi al con di t ions for our model. b. 寫計算機模擬 例 1 : t his model leads to a puter si mulati o n of catc h can tests o f th e irrigat ion syste m a nd …… c. 運用數(shù)據(jù)模擬 例 1 : to ground th is model in reality, we incorp orate ext en sive demograp hic data a nd run …… d. 講詳細分析 例 1 : We physically characte riz e the system that … 例 2 : We provide a st rat egy (writ e t he log ic al s tra t egy ). 3 .總結(jié)該模型的結(jié)果 / 得到什么結(jié)論 a. 說明不是最優(yōu)但能產(chǎn)生作用 例: W e show that this st rategy is no t op ti m al bu t ca n be im pro ve d by as si gn in g dif fer ent numbers …… b. 說明如果用這個模型,結(jié)果如何 例 2 : We m od ify th e m od el to ref le c t (so m e tre nd such as expon e ntial ly incre as i ng…… ) an d ge neral ize the m od el to