9月15日，来自天津医科大学的专家（左）在天津文化中心向市民介绍“营养金字塔”。当日，以“食品安全与公众健康”为主题的2012年全国科普日天津活动在天津文化中心举行，相关专家通过现场实验和科普讲座宣传食品安全与公众健康知识。新华社发（李想 摄）     On September 15,,From tianjin medical university experts(left)In tianjin cultural center introduced to citizens"Nutrition pyramid".On that day,to"Food safety and public health"As the theme of the 2012 national science in tianjin, tianjin activities held cultural center,Relevant experts through the field experiment and popular science propaganda lecture food safety and public health knowledge.The xinhua news agency hair(LiXiang perturbation)

    9月15日，来自天津医科大学的专家（左）在天津文化中心向市民演示糙米和精米的营养对比实验。新华社发（李想 摄）     On September 15,,From tianjin medical university experts(left)In tianjin cultural center to the citizen demo brown rice and polished rice nutrition contrast experiment.The xinhua news agency hair(LiXiang perturbation)