英文：She is sixteen year old but has a mental age of five.
中文：她十六岁，而智力年龄是五岁。
英文：A person of mild mental retardation having a mental age of from7 to12 years and generally having communication and social skills enabling some degree of academic or vocational education. The term belongs to a classification system no longer in use and is
英文：A person of profound mental retardation having a mental age below three years and generally being unable to learn connected speech or guard against common dangers. The term belongs to a classification system no longer in use and is now considered offensiv
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