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Fluorin element is one of 14 necessary trace elements in body.
氟是人体必需的14种微量元素之一。
youdao
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Trace elements Lron, Manganese are necessary to the plant growth.
铁、锰是植物体生长必需的微量元素。
youdao
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Trace elements Lron, Manganese are necessary to the plant growth.
铁、锰是植物体生长必需的微量元素。
youdao