新概念英语第四册第七课全文句子成分分析Lesson7Bats蝙蝠Notallsounds定语madebyanimalsserveaslanguage,andwehaveonlytoturntothatextraordinarydiscoveryofecho-locationinbats状语toseeacase定语inwhichthevoiceplaysastrictlyutilitarianrole.状语Togetafullappreciationofwhatthismeanswemustturnfirsttosomerecenthumaninvent...
Lesson7Bats蝙蝠Notallsounds定语madebyanimalsserveaslanguage,andwehaveonlytoturntothatextraordinarydiscoveryofecho-locationinbats状语toseeacase定语inwhichthevoiceplaysastrictlyutilitarianrole.状语Togetafullappreciationofwhatthismeanswemustturnfirsttosomerecenthumaninventions.Everyoneknowsthatifheshouts状语inthevicinityofawalloramountainside,anechowillcomeback.Thefurtheroffthissolidobstruction,thelongertimewillelapseforthereturnoftheecho.Asound定语madebytappingonthehullofashipwillbereflectedfromtheseabottom,andbymeasuringthetimeintervalbetweenthetapsandthereceiptoftheechoes,thedepthofthesea定语atthatpointcanbecalculated.Sowasborntheecho-soundingapparatus主语,nowingeneraluseinships.Everysolidobjectwillreflectasound,状语varyingaccordingtothesizeandnatureoftheobject.Ashoaloffishwilldothis.Soitisacomparativelysimplestepfromlocatingtheseabottomtolocatingashoaloffish.状语Withexperience,andwithimprovedapparatus,itisnowpossible主语notonlytolocateashoalbuttotellifitisherring,cod,orotherwell-knownfish,bythepatternofitsecho.It形式主语hasbeenfound主语thatcertainbatsemitsqueaksandbyreceivingtheechoes,theycanlocateandsteerclearofobstacles--orlocateflyinginsects定语onwhichtheyfeed.Thisecho-locationinbatsisoftencomparedwithradar,theprincipleofwhichissimilar定语.
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