The sources of heavy metals pollution are complex, so it is necessary to study the reasons and countermeasures of over standard.
重金属污染来源很复杂，对中药产品中的重金属元素超标的原因及对策的研究势在必行。
The sources of heavy metals pollution are complex, so it is necessary to study the reasons and countermeasures of exceeded quota of it .
重金属污染来源复杂，对中药产品中的重金属元素超标的原因及对策的研究势在必行。
Objective To study the influence of sleep deprivation and society isolation on psychological function of group and explore effective psychological countermeasures.
目的研究睡眠剥夺、社会隔离等复合因素对小组心理功能的影响并探索行之有效的心理对抗措施。
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