目的对比食用富硒食品前后老年人血硒水平的变化，为老年人硒膳食营养提供参考。
Objective Compared the change of blood se level in the elderly people before and after taking food enriched-selenium, and provided references of meal nutrition for the elderly people.
湖泊富营养化是湖泊水体在自然因素和人类活动的影响下，逐步由生产力低的贫营养状态向生物生产力较高的富营养状态变化的一种现象。
Entrophication is a phenomenon that lakes change gradually from poor nutrition and less productivity into rich nutrition and high productivity under the effect of anthropogenic activity.
湖泊富营养化是湖泊水体在自然因素和人类活动的影响下，逐步由生产力低的贫营养状态向生物生产力较高的富营养状态变化的一种现象。
Entrophication is a phenomenon that lakes change gradually from poor nutrition and less productivity into rich nutrition and high productivity under the effect of anthropogenic activity.
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