大学英语四级阅读复习方法分享 英语四六级报名

下面小编跟大家一起了解大学英语四级阅读复习分享，希望对大家的学习有所帮助。

第41篇：海洋学的历史

OceanographyhasbeendefinedasTheapplicationofallsciencestothestudyofthesea".Beforethenineteencentury,scientistswithaninterestintheseawerefewandfarbetween.CertainlyNewtonconsideredsometheoreticalaspectsofitinhiswritings,buthewasreluctanttogotoseatofurtherhiswork.Formostpeopletheseawasremote,andwiththeexceptionofearlyintercontinentaltravelersorotherswhoearnedalivingfromthesea,therewaslittlereasontoaskmanyquestionsaboutit,letalonetoaskwhatlaybeneaththesurface.Thefirsttimethatquestion

Whatisatthebottomoftheoceans?"hadtobeansweredwithanycommercialconsequencewaswhenthelayingofatelegraphcablefromEuropetoAmericawasproposed.Thehadtoknowthedepthprofile(起伏形状)oftheroutetoestimatethelengthofcablethathadtobemanufactured.mote,andwiththeexceptionofearlyintercontinentaltravelersorotherswhoearnedalivingfromthesea,therewaslittlereasontoaskmanyquestionsaboutit,letalonetoaskwhatlaybeneaththesurface.ThefirsttimethatquestionWhatisatthebottomoftheoceans?"hadtobeansweredwithanycommercialconsequencewaswhenthelayingofatelegraphcablefromEuropetoAmericawasproposed.Theengineershadtoknowthedepthprofile(起伏形状)oftheroutetoestimatethelengthofcablethathadtobemanufactured.

ItwastoMauryoftheUSNavythattheAtlanticTelegraphCompanyturned,in1853,forinformationonthismatter.Inthe1840s,Mauryhadbeenresponsibleforencouragingvoyagesduringwhichsoundings(测身)weretakentoinvestigatethedepthsoftheNorthAtlanticandPacificOceans.Later,someofhisfindingsarousedmuchpopularinterestinhisbookThePhysicalGeographyoftheSea.Thecablewaslaid,butnotuntil1866wastheconnectionmadepermanentandreliable.Attheearlyattempts,thecablefailedandwhenitwastakenoutforrepairsitwasfoundtobecoveredinlivinggrowths,afactwhichdefiedcontemporaryscientificopinionthattherewasnolifeinthedeeperpartsofthesea.Withinafewyearsoceanographywasunderway.In1872Thomsonledascientificexpedition(考察),whichlastedforfouryearsandbroughthomethousandsofsamplesfromthesea.Theirclassificationandanalysisoccupiedscientistsforyearsandledtoafive-volumereport,thelastvolumebeingpublishedin1895.