第一单元Fundamentally,engineeringisanend-product-orienteddisciplinethatisinnovative,cost-consciousandmindfulofhumanfactors.Itisconcernedwiththecreationofnewentities,devicesormethodsofsolution:anewprocess,anewmaterial,animprovedpowersource,amoreefficientarrangementoftaskstoaccomplishadesiredgoaloranewstructure.Engineeringisalsomoreoftenthannotconcernedwithobtainingeconomicalsolutions.And,finally,humansafetyisalwaysakeyconsideration.从根本上,工程是一个以最终产品为导向的行业,它具有创新、成本意识,同时也注意到人为因素。它与创建新的实体、设备或解决方案有关:新工艺、新材料、一个改进的动力来源、任务的一项更有效地安排,用以完成所需的目标或创建一个新的结构。工程是也不仅仅关心获得经济的解决方案。最终,人类安全才是一个最重要的考虑因素。Engineeringisconcernedwiththeuseofabstractscientificwaysofthinkingandofdefiningrealworldproblems.Theuseofidealizationsanddevelopmentofproceduresforestablishingboundswithinwhichbehaviorcanbeascertainedarepartoftheprocess.工程关心的是,使用抽象的科学方法思考和定义现实世界的问题。理想化的使用和发展建立可以确定行为的边界的程序,是过程的一部分。Manyproblems,bytheirverynature,can’tbefullydescribed—evenafterthefact,muchlessattheoutset.Yetacceptableengineeringsolutionstotheseproblemsmustbefoundwhichsatisfythedefinedneeds.Engineering,then,frequentlyconcernsthedeterminationofpossiblesolutionswithinacontextoflimiteddata.Intuitionorjudgmentisakeyfactorinestablishingpossiblealternativestrategies,processes,orsolutions.Andthis,too,isallapartofengineering.很多的问题,就其本身的性质而言,不能完全被描述——即使这一事实,在其开始之前。然而还必须找到对于这些问题可接受的工程解决方案,来满足预定的需求。直觉或判断是建立可能的替代策略、流程或解决方案的关键因素。。而这也是工程的一部分。Civilengineeringisoneofthemostdiversebranchesofengineering.Thecivilengineerplans,designs,constructs,andmaintainsalargevarietyofstructuresandfacilitiesforpublic,commercialandindustrialuse.Thesestructuresincluderesidential,office,andfactorybuildings;highways,railways,airports,tunnels,bridges,harbors,channels,andpipelines.Theyalsoincludemanyotherfacilitiesthatareapartofthetransportationsystemsofmostcountries,aswellassewageandwastedisposalsystemsthataddtoourconvenienceandsafeguardourhealth.土木工程是工程的最多样化的分支机构之一。土木工程师计划、设计、施工,和维护大量的结构和公共、商业和工业使用的设施。这些结构包括住宅,办公室和工厂大厦;公路、铁路、机场、隧道、桥梁、港口、渠道和管道。在其他大多数的国家它们还包括运输系统许多其他设施,以及将为我们的生活带来便利的和维护我们的健康污水及废物处理系统。Theterm“civilengineer”didnotcomeintouseuntilabout1750,whenJohnSmeaton,thebuilderoffamousEddystonelighthousenearPlymouth,England,issaidtohavebeguncallinghimselfa“civilengineer”todistinguishhimselffromthemilitaryengineersofhistime.However,theprofessionisasoldascivilization.直到大约1750年,人们才开始使用“土木工程师”这一术语。约翰.斯密顿在英格兰普利茅斯附近,建造了著名的埃迪斯通灯塔的建造师,开始自称为“土木工程师"来将自己与当时的军事工程师区分开。然而,土木工程这个职业却像文明一样古老。InancientEgyptthesimplestmechanicalprinciplesanddeviceswereusedtoconstructmanytemplesandpyramidsthatarestillstanding,includingthegreatpyramidatGizaandthetempleofAmon-RaatKarnak.Thegreatpyramid,481feet(146.6meters)high,ismadeof2.25millionstoneblockshavinganaverageweightofmorethan1.5tons(1.4metrictons).Greatnumbersofme...