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汉语拼音：zhì lì là hòu

也称智力低下”、精神发育迟缓”。由某些疾病或其他因素导致智力发展在平均水平以下的状态。由智商、社会适应能力、开始于十六岁或十八岁以前三个指标决定。最轻的称为低能”，最重的称为白痴”。

• The younger group group's concept of "long duration or short duration" is not very clear.

  低、中年龄组智力落后儿童的“时距长短”概念发展尚不完全，判断的发展趋势尚不明显。

• However, only the group aged 14 to 16 shows a sufficient grasp of the arrangement of the items with the same length.

  但对相同物品排列长短，只有14至16岁组智力落后儿童能熟练掌握。

• MR children's ability of estimation of duration improved along with the growth of age.

  随着年龄的增长，智力落后儿童的时距估计水平逐步提高。

• The group aged 14 to 16 displays a rapid grasp of the arrangement of the items with the same length.

  14至16岁年龄组中重度智力落后儿童对相同物品长短排列的熟练掌握方面表现出快速增长。

• MR children's "long duration or short duration" concept develops rapidly during the age 13-15, which is also the elder group.

  而高年龄组即13-15岁这一时期是智力落后儿童“时距长短”概念迅速发展的时期。

• Analyses of the relation between psychomotor obstruction and mild delay of intelligence of children in iodine deficiency disorder regions

  碘缺乏病病区儿童精神运动障碍与轻度智力落后的关系

• Investigation on children's mild intelligent retarded rates and endemic subclinical injury in iodine deficiency disorders regions

  碘缺乏病区儿童轻度智力落后及亚临床损伤的调查

• Evolution and enlightenment of the definition of mental retardation

  智力落后定义的演变及其启示

• American Association on Mental Retardation

  美国智力落后协会