Moreover, the processing of ores introduced poorly controlled changes in the concentrations of minor and trace elements in the resulting metal.
此外，对矿石的加工过程也在随之而形成的金属中引入了某些有失控制的次要和微量元素含量的变化。
It is necessary for us to measure and control the heavy metal elements in Chinese traditional medicine, as harmful trace elements have side effects found by this study.
也反映了中药中有害微量元素存在着一定的不良反应，必须对中药中的重金属元素进行检测和控制。
The origin and harmfulness of heavy metal waste water were expounded, and the basic property of trace elements in waste water was discussed.
论述了重金属废水的来源和危害，讨论了废水中微量元素的基本特性。
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