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trace element英英字典_trace element剑桥英语解释_trace element柯林斯英文解释_果味酸柯林斯词典
果味酸柯林斯词典

trace element

T 开头单词

柯林斯词典

    trace element (trace elements)

  • 1. N-COUNT A trace element is a chemical element such as iron or zinc that occurs in very small amounts in living things and is necessary for normal growth and development. 痕量元素

  • 2. N-COUNT A trace element is a very small amount of a chemical element that is found in a metal or other substance. 微量元素

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剑桥词典