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Haveyoueverwonderedwhybirdssing?Maybeyouthoughtthatthe...
问题详情: Haveyoueverwonderedwhybirdssing?Maybeyouthoughtthattheywerejusthappy.Afterall,youprobablysingorwhistlewhenyouarehappy. Somescientistsbelievethatbirdsdosingsomeofthetimejustbecausetheyarehap...