VOA慢速英语2014.01.14 英语, levels, highest, created, children

Rebecca949

The study found that lead created the highest pollution levels, this metal if absorbed into the blood, can harm the brain development of unborn babies, and lower the intelligence of children.研究发现铅造成的污染水平最高,这种金属一旦被血液吸收,就会损害胎儿的神经发育和降低儿童的智力.
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