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微量物质
1. 对于藻类、无脊椎动物和脊椎动物的新陈代谢过程必不可少的金属和非金属。对于几乎所有能量来源于光合作用的生物体尤其依赖于溶解的微量物质。2.在很小但可探测的级别出现的杂质。
environ.
oligosubstàncies i residus
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