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Nextfallwhenyou seegeeseheadingsouthforthewinterorfl...
问题详情: Nextfallwhenyou seegeeseheadingsouthforthewinterorflyingin“V”formation(队形),youmightconsiderwhat sciencehasdiscoveredastowhytheyflythatway. Aseachbirdspreadsitswings,itcreatesa...