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除生命元素外,目前还知道有四十多种微量元素存在于人体内,但对其生物功能不甚了解。估计在它们中可能存在着一类对生物体具有营养作用,但又非必需的元素。这就需要对它们的营养作用、毒性大小进行判别。本
In addition to the elements of life, it is also known that there are more than forty kinds of trace elements in the human body, but their biological function is not well understood. It is estimated that there may be a class of elements in them that are nourishing but not essential to the organism. This requires their nutritional role, the size of toxicity discrimination. this