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1、1aspeoplecontinretogrowandage,ourbodysystemscontinuetochange,atacertainstageinyourlife,yourbodysystemwillbegintobeweaker,yourjointsmaybecomestiffitmaybecomemoredifficultforyoutoseeandhear.theslowchangeofagaingcarsesourbodiestolosesomeoftheirabilitytorecoverfromdiseaseandinjury.inordertolivelon
2、ger,wehavealwaystriedtosloworstopthisprocessthatleadsustowardtheendofourlivesmanyfactorscontributetoyourhealthawell-balanceddietplaysanimportantrole.theamountandtypeofexercisesyougetisanotherfactor.yourlivingenvironmentandtheamountofpresureyouareunderisstillanother.butscientistsstudyingagingwa
3、nttoknow:whydopeoplegetold?theyhopethatbyexaminingtheagingprocessonthelevelofcells,medicalscieneemaybeabletomakelifelonger随着人们继续增长和年龄，我们的身体系统的不断变化，在你生活屮的某些阶段，你的身体系统将开始疲软，你的关节可能变得僵硕，它可能会变得更加困难，给你看和失去一些疾病和损伤恢复的能力为了活得更长，我们一-直试图以减缓或阻止这一进程，使我们病房我们的生活结朿许多因素有助于您的健康，良好的均衡饮食中起着重要作用。你的练习的数量和类型，另一个因素是您的生
4、活环境和量的压力，您是在仍然是另一回事，但研究老化的科学家们想知道:人为什么会老的，他们希望通过研究在细胞水平的衰老过程，医学科学能够使寿命更长2formorethan40years,earthhasbeensendingoutdistesssignals.atfirst,theyweresuble,thenthesignswereunmistakable.finally,asthenewmillenniumdrewnear,itwasobviousthatearth'spainhadbecomehumansrpain.thecollapseofthenorthatlanticfi
5、sheryput30,000Canadiansoutofworkandruinedtheeconomiesof700communities.twoyiarsago,thefloodsinchinakilled3,600peopleandleft14millionhomeless.populationpressuresandovercrowdingmadethesituationevenworseandhowhavewerespondedtofourdecadesofeverlouderdistresssignals?we,vestgedaprocessionofearthdays,
6、formedgreenparties,passedenvironmentallaws.allthewhilethedeclineofearth1ecosystemshascontinuedworseningwhatwillittakeforrstogetseriousabortsavingoruenvironment?pnecrucialstepisatrueaccountngofthestateoftheplaner,athoroughexaminationofthehealthofallearth'smajorecosystems,onlyacomprehensivegloba
7、lsurveycanshowhowdamagetoonesystemisaffectingothersystemsandcandeterminewhetherearthasawholeislosingitsabilitytonurturethefulldiversityoflifeandeconomiesofnations超过40年，地球已经发岀distess信号。起初，他们被suble,然后迹unmistakable.finally,作为新千年的临近，很明显，已成为
