Scientistshavefoundthatmigrating(迁徙)birdsflynotjustingr...
04-18
问题详情:Scientistshavefoundthatmigrating(迁徙)birdsflynotjustingroupsallthetime,butin“V”formationandtheyhavealsotriedtofindoutwhatgoodpointsbirdsgetfromthis“V”formation.Now,aresearchgroupfromtheUn...