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1、Lesson20SnakepoisonHowitcameaboutthatsnakesmanufacturedpoisonisamysteryOvertheperiods经过很长时间，在经过很长时间，在期间，期间，在在过程中过程中theirsaliva,amild,digestivejuicelikeourown,wasconvertedinto改变成改变成apoisonthatdefiesanalysiseventodayThesolarcellcanconverttheenergyofsunlightintoelectricenergy.Itwasnotforcedupon把把强加给某人强
2、加给某人thembythesurvivalcompetition;theycouldhavecaughtandlivedon（注：注：liveon后面不可跟后面不可跟sb.liveoff后面可以跟后面可以跟sb或或sth，意思，意思分别是分别是“靠什么人养活靠什么人养活”和和“靠什么活着靠什么活着”。）。）preywithoutusingpoison含蓄条件句含蓄条件句,justas方式状语从句方式状语从句thethousandsofnon-poisonoussnakesstilldoPoisontoasnakeismerelyaluxury;itenablesittogetitsfoodwi
3、thverylittleeffort,nomoreeffortthanonebite同位语同位语Andwhyonlysnakes?Cats,forinstance,（省略iftheyhadpoison，含蓄条件句）wouldbegreatlyhelped;norunningfightswithlarge,fierceratsortussleswithgrownrabbits-justabiteandnomoreeffortneededratInfact,itwouldbeanassistancetoallcarnivoresthoughitwouldbeatwo-edgedweapon一把双刃
4、剑（也可说成double-edgedsword）whentheyfoughteachother例句：Scientificdevelopmentmaybeatwo-edgedweapon,ononehanditliftspeopleslivingstandard,ontheotherhanditposespotentialthreatstotheenvironment.But,of（among）thevertebrates,unpredictableNatureselectedonlysnakes(andonelizard)OnewondersalsowhyNature,withsomesnak
5、es,concoctedpoisonofsuchextremepotency.Intheconversionofsalivaintopoison,onemightsuppose（某种可能性）thatafixedprocesstookplaceItdidnot;somesnakesmanufacturedapoisondifferentineveryrespect在各个方面fromthatofothers,（asdifferentasarsenicisfromstrychnine,andhavingdifferenteffects）arsenicPoisnouseffectofarsenicAr
6、senic occurs in many minerals,mainlycombined with sulfur硫硫磺磺and metals,andalso naturally in the native(elemental)state.Strychnine is a very toxic,colorlesscrystalline alkaloidlklid n.生生 物物 碱碱)usedasapesticide,particularlyforkillingsmall vertebrates such as birds androdents啮齿动物啮齿动物.Onepoisonactsonthe
7、nerves,theother（act）onthebloodacton，对起作用；遵照。Ifaforceorsubstanceactsonsomeoneorsomething,ithasacertaineffectonthem.例句：Thesemedicalherbsaresaidtoactontheheart.ThemakersofthenervepoisonincludethemambasandthecobrasandtheirvenomiscalledneurotoxicIfyouactonadviceorinformation,youdowhathasbeenadvisedorsugg
8、ested.例句：Apatientwillusuallylistentothedoctorsadviceandactonit.Vipers(adders)andrattlesnakesmanufacturethebloodpoison,whichisknownashaemolyticViper/adderrattlesnakeNeurotoxicpoisoneffectHaemolyticpoisoneffectBothpoisonsareunpleasant,butbyfar（得多，显然：修饰比较级或者最高级）themoreunpleasantisthebloodpoison例句：Itisq
9、uickerbyfartogobytrain.Itissaidthatthenervepoisonisthemoreprimitiveofthetwo,thatthebloodpoisonis,sotospeak“可以这可以这样说样说”，“打个比方说打个比方说”,anewerproductfromanimprovedformulaBethatasitmay倒装的让步状语从句，相当于倒装的让步状语从句，相当于howeverthatmaybe，可译成，可译成“尽管如此尽管如此”,thenervepoisondoesitsbusinesswithman在人的身上发挥作用，要人的命在人的身上发挥作用，要人的命farmorequicklythanthebloodpoisondoonesbusiness产生效果，完成某人的工作This,however,meansnothingSnakesdidnotacquiretheirpoisonforuseagainstmanbutforuseagainstpreysuchasratsandmice,andtheeffectsontheseofviperinepoisonisalmostimmediate.17以上有不当之处，请大家给与批评指正，以上有不当之处，请大家给与批评指正，谢谢大家！谢谢大家！
新概念四Lesson-20-Snake-Poison
