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| micro element; micromineral; oligo-element; trace element; trace mineral | |||
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| micro elements; minor elements; trace elements | |||
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| trace element; trace elements; trace element Any of various chemical elements that occur in very small amounts in organisms and are essential for many physiological and biochemical processes | |||
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element-trace : 19 短语, 11 学科 |
| 信息技术 | 1 |
| 化学 | 1 |
| 医疗的 | 1 |
| 地球科学 | 1 |
| 地质学 | 1 |
| 煤炭 | 1 |
| 环境 | 2 |
| 纺织工业 | 2 |
| 自然资源和野生动物保护 | 7 |
| 行业 | 1 |
| 道路工程 | 1 |