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- 问题详情：BeesaddanestimatedeighteenbilliondollarsayeartothevalueofAmericancrops.Theypollinate(授粉)flowersthatbecomefruits,nutsandvegetables.But,inrecentyears,honeybeecoloniesintheUnitedStatesandEuropehavebeenshrinking.Scientistshaveproposeddifferentt...
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