...ldmental retardation）；（2）中度智能不足（moderate mental retardation）；（3）重度智能不足（severe mental retardation）；（4）深度智能不足（profound mental retardation）；（5）不确定型智能不足（unspecified mental retardation）。见该等条。
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The children with moderate to severe mental retardation maintain a progressively decreasing accuracy in their judgment of the increasingly difficult tasks.
中重度智力落后儿童对难度不同的任务的判断正确率随着实验难度的增加而降低。
Mn deficiency during pregnancy may impede the development of fetal bone can also affect the synthesis of hormones, leading to severe mental retardation fetus.
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。
This report describes a female ease who is complete deletion of secondary constriction on two chromosomes 9. The major clinical phenomenon is severe mental retardation.
本文报道了一例两条9号染色体次缢痕缺失的女性病例，临床表现为严重智力低下和语言障碍。
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