| 释义 |
trace elementBrE /ˈtreɪs elɪmənt/NAmE /ˈtreɪs elɪmənt/ nouna chemical substance that is found in very small amounts 痕量元素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） |