单词：trace element
trace element的用法和样例：
例句
- The regularity of random error of trace element analysis is discussed.本文讨论了痕量元素分析中随机误差的规律性。
- In order to control impurities content in pure tungsten powder, it is important to determine trace As and Sn in pure tungsten powder.为控制纯钨粉中杂质元素的指标，准确测定其中痕量元素砷和锡的含量十分必要。
- Trace element mixes serve as insurances.微量元素只是作为一种保障措施。
- Kelp is rich in vitamins and trace elements.大型褐藻富含维他命和微量元素。
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