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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)

See also: trace element

trace element
Chemical elements:actinium, alkali metal, americium...

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