魏碑心思朗文詞典
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    trace element

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    柯林斯詞典

      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

    • 返回 trace element

    劍橋詞典

      one of several types of simple chemical substance that are necessary for healthy growth and development , and exist in animals and plants in very small amounts
      微量元素 返回 trace element
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