学科：地球化学 词目：正常铅 英文：norrnal lead 释文：正常铅为普通铅之一，是岩石和矿物中U/Pb、Th/Pb比值与地壳平均值相似的任何形式的铅，其铅同位素组成模式年龄与含铅矿物、岩石地质年龄一致。
镉、铅、汞和锰的检测都表明处于正常值范围。
Tests for cadmium, lead, mercury and manganese have shown levels within the normal range.
孕妇和幼儿是最易受损的人群，因为铅极易通过胎盘进入胎儿大脑，并且可以干扰其正常发育。
Pregnant women and young children are particularly vulnerable to exposure because lead easily crosses the placenta and enters the fetal brain, where it interferes with normal development.
结论急性染铅可使磷酸化的ERK2含量在一定的时间内降低，经过一段时间后显示向正常恢复的趋势。
Conclusion Acute lead exposure could make the content of phosphorylated ERK2 decrease in some time, then returned normally after a stage of time.
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