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trace element

noun
🔊/ˈtreɪs elɪmənt/
🔊/ˈtreɪs elɪmənt/
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  1. a chemical substance that is found in very small amounts痕量元素
  2. a chemical substance that living things, especially plants, need only in very small amounts to be able to grow well微量元素（生物，尤指植物，生长所需要的微量的化学物质）