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1、中学生VOA英语阅读之试管小狗的成功可拯救濒临灭绝动物TestTubePupsMayHelpRescueEndangeredSpeciesTheseplayfulpupsarepartoflitterofSeven,bornJuly10,camefrom19embryosimplantedinthesamefemaledog.Fivearebeaglesandtwoarebeagle-cockerspanielmixes.这几个活蹦乱跳的小狗都是塞文的小崽,出生于6月10日。塞文被植入19个受精
2、卵,并产下5只毕格尔猎犬和2只毕格尔与史宾格混种猎犬。Otheranimals,aswellashumans,havebeensuccessfullybredthroughartificialinsemination,butperfectingtheprocessindogstookdecadesbecauseofthecriticaltiminginfertilizationofthefemaledog’seggs.一些其他动物,包括人类都成功实现了人工受精,而小狗人工受精技术一直没取得成功,
3、主要是由于母狗受精的时间很难把握。Previously,onlyonedogwasbornfromafrozenembryo,in2012,atthesameCornellUniversitylab.2012年,同样在康奈尔大学实验室中,为小狗植入冷冻受精卵,却仅有一只小狗顺利诞生。Scientistssaythenewsuccessopensthedoortosavingendangeredspeciesofdogs.科研人员表示,这一技术的成功打开了保护濒于灭绝动物的大门。“LiketheA
4、fricanpainteddog,ifwewanttobreedthemincaptivityandwecollect,say,theireggsandsperm,wehavetobeabletodoIVFtocreatenewmembersofthatspecies.”“比如说非洲的一种野狗,如果我们想圈养这种野狗,可以采集其精子和卵子,通过体外受精,成功之后会就会诞生同品种的小狗。”Successfullyfertilizingeggsinthelabcouldalsohelpelimina
5、temanyofthediseasetraitsindogs.小狗体外受精的成功对减少小狗疾病将有很大的好处。“Itopensupthepossibilitythatwecouldidentifycertaingenesthatcausediseaseandthenfixthose,replacethemwithagoodcopyofthegene,beforethosedogsareevenborn.Soinsteadoftryingtocuredisease,wecanhelpprevent
6、itfromhappeninginthefirstplace.”“这项实验的成功标志着我们能识别致病基因并修复基因,在小狗未出生前,即可更换其缺陷基因。所以与其说我们治疗疾病,不如说我们从源头上预防疾病。”CornellUniversityscientistssaythatthecompleteunderstandingofinvitrofertilizationofdogswillalsohelpunveilthegeneticbasisofsomeofthemorethan350disord
7、ersthathumanssharewithdogs.康奈尔大学的科研人员还表示,人类和小狗有着350多项相同疾病,小狗体外受精技术的成熟也将帮助揭开人类基因未解之谜。单词及例句详解1playful['pleɪfl]闹着玩的;爱玩的;戏谑的;例句1.Moreandmorecompaniesarerealizingthevalueofplayfulworkenvironments.越来越多的公司正在意识到玩耍娱乐和工作环境的价值。2.Thelittlecatgavemea playful bite
8、.小猫顽皮地轻轻咬了我一下。3.Playful inanaughtyorteasingway.淘气的,顽皮的以一种顽皮或淘气的方式嬉戏的2pups[pʌps]pupies小狗,幼犬,自负的青年;例句1.Also,detectionofPotentiallyUnwantedPrograms(PUPs)hasbeenadded.此外,检测潜在有害程序(PUPs)增加了。3embryos['embrɪəʊz]晶胚;andlt;生andgt;胚,胚胎(embryo的名词复数);例句1.TheEmbryo