Beesaddanestimatedeighteenbilliondollarsayeartothevalue...
问题详情：BeesaddanestimatedeighteenbilliondollarsayeartothevalueofAmericancrops.Theypollinate(授粉)flowersthatbecomefruits,nutsandvegetables.But,inrecentyears,honeybeecoloniesintheUnitedStatesandEurope...