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