Fluorine is one of the necessary trace elements for the body and it has many physiological effects.
氟是机体生命活动所必需的微量元素之一，具有多方面的生理作用。
The result showed there are many trace elements which human body need, and has rather high medical value.
结果表明，一枝黄花含有很多和人体健康密切相关的微量元素，具较高的药用价值。
One single set of synthetic standards of silica matrix will suffice for the determination of as many as 25 associated elements and trace elements in a variety of minerals.
仅用一套二氧化硅为基体的人工标准，就能测定多种单矿物中的25项伴生元素和痕量元素。
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