英语翻译
Weknowthatmanyanimalsdonotstayinoneplace.Birds,fishandotheranimalsmovefromoneplacetoanotheratacertaintime.Theymovefordifferentreasons.Whencoldweathercomes,manybirdsmovetowarmerplacestofindfood.Thesalmonisborninfreshwaterbutittravelsmanymilestosaltwater.Thereitspendsitslife.Whenitisold,itreturnstoitsbirthplaceinfreshwater.Thenitgivesbirthanddies.InnorthernEurope,thereisakindofmouse.Theyleavetheirmountainhomeswhentheybecometoocrowded.Theymovedowntothelowland.Sometimestheymoveallthewaytotheseaside,andmanyofthemarekilledwhentheyfallintothesea.Recently(近来),scientistshavestudiedthemigrationofakindoflobster(龙虾).Everyyear,
whentheseasonofthebadweatherarrives,thelobstersgetintoalonglineandstarttowalk
acrosstheflooroftheocean.Nobodyknowswhytheydothis,andnobodyknowswheretheygo.So,sometimesweknowwhyhumansandanimalsmovefromoneplacetoanother,butatother
timeswedon’t.Maybelivingthingsjustliketotravel
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