胎儿内耳受到噪音的刺激，能使脑的部分区域受损，并严重影响智力的发育。
Fetal inner ear by noise stimulation, the brain can damage parts of the region, and seriously affect the intellectual development.
孕期缺锰会阻碍胎儿骨骼发育，也可影响激素的合成，导致胎儿严重智力低下。
Mn deficiency during pregnancy may impede the development of fetal bone can also affect the synthesis of hormones, leading to severe mental retardation fetus.
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