词典释义：
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精神发育迟滞；智力迟钝；智障
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Many factors can lead to growth retardation in unborn babies.
许多因素可以导致胎儿发育迟缓。
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Acute exposure to lead may impact mice behavior altering such as irritability, hyperkinesis, retardation of learning and memory, etc.
急性铅暴露可能影响小鼠的行为改变，如易怒、运动亢进、学习和记忆迟钝等。
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A score below 70 May indicate mental retardation.
分数低于70可能表明你有智力缺陷。
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In addition, 4 patients presented with growth retardation.
此外，4例患者表现出生长发育迟缓。
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Brain damage, leading to mental retardation and occasionally seizures.
脑损伤，并导致智力迟钝和无规律的抓握动作。