大学毕业英文翻译原文

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1、外文翻译原文BridgeDesignConcept1NecessityofbridgesBridgesarevitleforthedevelopmentofacountrysincetheseenabletransportingmaterialsfromonetotheotherwhichmaybeseparatedbystreamsandrivers,therebymaintaininguniformflowofessentialgoodsfordevelopment.Intimesofwar,materialsareswiftlytransportedfor

2、thedefenceofthecountrybyrailroadbridges.Bridgeslinkthewhole–countrywithroadandrailwaycommunicationmaintainingauniformflowofpeople,goodsandotheressentialcommodities.Thenecessityofbridgesmaythereforebesummarizedafollows:（1）Bridgesenablethefreeflowoftrafficduringmonsoonsandotherperiodso

3、finclementweather.（2）Bridgesprovideadditioncommunicationfacilities.（3）Thedevelopmentofthebackwarddistrictswhichmayberichagriculturallycriticallydependsontheexistenceofbridges.（4）Bridgesprovidemoresocio-economicbenefitstothepeople.（5）Bridgesalsoenablemovementoftroopsandmilitaryvehicle

4、sduringhostilities.2SiteinvestigationBeforeabridgeisconstructed,asuitablesiteisselectedbasedoncertainfactorswhichhavebearingontheeconomyandstabilityofthebridge.Reconnaissanceisthereforemadeandthefollowingdataarerecordedtodeterminethefeasibilityofbridgeconstruction.Thefactorstobeconsi

5、deredwhileselectingthesiteforabridgearethe9外文翻译原文following:（1）Thebridgeshouldcrosstheriveratrightanglestothedirectionofflowofstreamorriverwatersoastominimizethelengthofthebridge.（2）Thebanksoneithersidesoftherivershouldhavefirmsoilandbestraightandwell-defined.Thiswillincreasethestabil

6、ityofthebridgeandreducethepossibilityoftheerosionofthebanks.Also,thesoilneednotbestabilizedorgivenanyothertreatmentwhichwillincreasethecost.（3）Theselectedsiteshouldbeataplacewheretheriverisnarrowandtheflowisastreamlinedonewithoutseriouswhirlsandcrosscurrents.Smallwidthreducesthelengt

7、hofthebridgewhichmeanslesscostofconstructionandmaintenance.Iftheflowofwaterisuniformandparallel,itisareliableguardagainstscour.（4）Precautionsshouldbetakentoseethattheselectedsiteshouldbefarawayfromwheretheriverislikelytochangethecourse.Ifthebridgehasbeenconstructedandtheriverhaschang

8、editscourse,