Results revealed that there was a negative relationship between neonatal umbilical blood lead level and their neurobehavioral score and behavioral ability.

结果：新生儿脐血铅含量与神经行为总分及行为能力评分间存在负相关关系。

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Currently, ten micrograms of lead per decileader (deciliter) of blood is what Federal Health officials in the United States call a level of concern.

最近，美国联邦健康署公布每十分之一公升血液含有10微克铅就是危险含量。

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