资源描述:
《土木工程专业英语lesson.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、§Lesson7Bridge课程学习指南:1.wordslearningPedestrian(行人)ped(pod,词根)-足pedal(足的,脚的、脚踏)Subsoil(底土)=sub(前缀:下、次)+soilOverlap(重叠,搭接)=over(前缀:=super)+lap(接)Intersect(交叉)=inter(前缀:相互之间的)+sect(段、部分=part)Bridgeisastructurethatspansobstacles,suchasriversandvalleys,toprovidearoadwayfortraffic.Byfarthemajorityofbridge
2、saredesignedtocarryautomobileorrailroadtraffic,butsomeareintendedforpedestriansonly.pedestrian nounapersonwalkingalongaroadorinabuilt-uparea步行者,行人adjectivelackinginspirationorexcitement;dull缺乏想像力的,平淡无奇的,乏味的为提供交通道路,桥梁是跨越如河流、山谷这样障碍的一种结构形式,到目前为止,大部分桥梁都是公路桥或铁路桥,仅有少部分是人行桥。Anumberofaqueductbridges,mostly
3、erectedinEuropeinthe19thcentury,carrycanalsandtheirbargetraffic;andatleastonebridge,atNewYorkCity’sKennedyAirport,servestocarrytaxyingaircraftoverahighway.aqueductbridge高架水渠verb(taxis,taxied,taxiingortaxying)(intransitive)(ofanaircraft)moveslowlyalongthegroundbeforetakeofforafterlanding:theplanetaxi
4、suptoawaitingcar.takeataxiasameansoftransport:Iwouldtaxihomeandsleeptilleight.大量的高架渠桥于19世纪在欧洲建成,以保证运河和船舶交通的运行。最小的一座桥在纽约市的肯尼迪机场,它主要是把滑行飞机拖到跑道上服务的。Thefirstbridgesbuiltbymanprobablyresembledthosestillbeingconstructedbyprimitivepeoplesinisolatedregions.primitive adj.原始的,早期的简单的;粗糙的原始人,原始事物人类建成的首批桥类似于原始人在
5、孤立地带建成的桥。Thetoolsandbuildingskillsofearlyman,likethoseofprimitivepeoplestoday,weresoelementarythathewasundoubtedlyforcedtouseeasilytransportablematerialsthatcouldbeputinplacewithaminimumofformingandshaping.早期人类的工具和建筑技术如同原始人类一样都是最初级的,只有应用经过简单加工成型的材料。Inforestregions,wherestouttimbersorlogscouldbeobtai
6、ned,bridgesverylikelyweremadeofonemoreparallellogs,possiblycoveredwithcrossbranchesormattingforbetterfooting.stout结实的;厚实的在森林里,随处可得结实的木材,那时侯的桥极可能是由并排的几根圆木建成,可能在其上覆一些木枝或草垫以方便行走。IntropicalregionsofIndia,Africa,andSouthAmerica,fibrousvineswereusedtobuildsuspensionbridges.Thevinesweretiedtotreesorrockson
7、eachsideofthestreamorvalleytobecrossed.Oneormorevineswereusedtotreadon.Othervines,strungseveralfeethigher,wereusedforhandholds.streamvalley河谷处于热带地区的印度、非洲、和南美洲,纤维藤用来建成悬索桥,这些藤系在小河或山谷两边的树上或岩石上,一根或更多的藤用于在