#笔译材料：锌对学生的记忆力有帮助 搜索结果
GRANDFORKS，N.D.-Zincimprovedthememoryofseventh-graderswhotookpartintheresearch，astudyfound.Atotalof209ofthemwereinvolvedinastudyatthefederalHumanNutritionResearchCenterinGrandForksfrom2002through2004.Jame
