词(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)极重度
神发育迟滞：智商在20以下，较少见，约占神发育迟滞的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)极重度神发育迟滞：智商在20以下，较少见，约占神发育迟滞的1%以内。
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成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
