Ithappenseveryspring.Flowerscomeouteverywhereonthesamed...
問題詳情:Ithappenseveryspring.Flowerscomeouteverywhereonthesameday.Buthowdoplants“know”whentoflower?Foryears,ithasbeenadifficultquestionforscientists.ButaUSresearchgroupmayhavefinallyansweredit—thes...