trace element
noun /ˈtreɪs elɪmənt/
/ˈtreɪs elɪmənt/
- a chemical substance that is found in very small amounts
- a chemical substance that living things, especially plants, need only in very small amounts to be able to grow well
单词 | trace element |
释义 | trace elementnoun /ˈtreɪs elɪmənt/ /ˈtreɪs elɪmənt/
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