- 問題詳情:Birdsknowwheretogowhenit’stimetomigrate.TheygetsomeofthatsuperbsenseofdirectionfromtheirabilitytospotEarth’smagneticfield.Thatmagneticsenseactsabitlikeacompassusedbyhumanhikers.Buttheenergycomingfromsomeelectronicdevicescanperturbabird’sin...
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