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Ithappenseveryspring.Flowerscomeouteverywhereonthesamed...
问题详情:Ithappenseveryspring.Flowerscomeouteverywhereonthesameday.Buthowdoplants“know”whentoflower?Foryears,ithasbeenadifficultquestionforscientists.ButaUSresearchgroupmayhavefinallyansweredit—thes...