trace amount meaning in English

微量

Certain other elements are needed in trace amounts for cell metabolism .
细胞的新陈代谢还需某些其它的微量元素。
Even foods that are eaten freshly, we now know, can contain chemicals in trace amounts that could, in large amounts, be dangerous .
我们现在知道，连我们吃的新鲜食品也含有微量的化学药剂，含量一大，就可能有危险。
Measurement of trace amount phosphorus in potable water
饮用水中痕量磷的检测
Edgar : there were trace amounts found in the animals ' blood
在动物的尸体里发现痕量
Determination of the trace amount of cadmium in edible oil
食用油中痕量镉含量的测定

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