单词：trace amount
trace amount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。
- As a safety measure, it is mixed with trace amounts of an odorant to allow its detection.作为一种安全措施，在甲烷中掺入痕量的有味气体以便辨识。
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