(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
：
在20
下，较少见，约占神发育迟的1%内。
（缩写为IQ）(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：在20下，较少见，约占神发育迟的1%内。
：
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