(4) ponderosity spends mental development arrearage: Intelligence quotient is in 20 the following, scarcer, occupy the 1% less than of mental development arrearage about.
(4)极重
发育迟滞：智商在20以下，较少见，约占发育迟滞的1%以内。
(4) ponderosity spends mental development arrearage: Intelligence quotient is in 20 the following, scarcer, occupy the 1% less than of mental development arrearage about.
(4)极重发育迟滞：智商在20以下，较少见，约占发育迟滞的1%以内。
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