计量泵控制着输给浇注头的铅量，没有过量的铅返回铅锅。
A metering pump regulates the amount of lead to the pour lead with no excess lead return to the pot.
血色病基因可引起铁的过量蓄积而致病，也会影响到铅的吸收。
Hemochromatosis gene, associated with a disease that leads to excessive iron accumulation, may also influence the absorption of lead.
锌、硒是生物的必须微量元素，铅、镉的过量摄入可影响人体锌、硒水平；
Zinc and selenium are essential microelements, excess intake of lead or cadmium ions would influence amount of zinc or selenium ions in organism;
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