| 释义 |
- n.微量元素；稀有元素
- 网络痕量元素；微量养分；示踪元素
1. | 痕量元素a chemical substance that is found in very small amounts |
2. | 微量元素（生物，尤指植物，生长所需要的微量的化学物质）a chemical substance that living things, especially plants, need only in very small amounts to be able to grow well |
n. | 1. a chemical element present in minute, but detectable amounts in something such as a metal or ore 2. an element that is required in minute amounts for normal growth and development and the functioning of vital enzyme systems, e.g. zinc, iodine, or manganese 4. a chemical element that a living thing needs in only extremely small amounts in order to grow and develop normally, for example iron or zinc 5. a chemical element that is found in extremely small amounts in a mineral 1. a chemical element present in minute, but detectable amounts in something such as a metal or ore 2. an element that is required in minute amounts for normal growth and development and the functioning of vital enzyme systems, e.g. zinc, iodine, or manganese 4. a chemical element that a living thing needs in only extremely small amounts in order to grow and develop normally, for example iron or zinc 5. a chemical element that is found in extremely small amounts in a mineral |
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