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一.定义 智力亦称智能,是指人的聪明程度。它包括感知、记忆能力,观察、认识能力和思维,创造能力。也可以说是学习知识技能,用以适应环境和改造环境的能力。 人的智力是随着年龄的增长逐渐发展起来的,因此不同年龄的儿童其智力水平是不一样的。智力低下（Mental retardation,MR）是指低于同年龄小儿的平均发育程度者,智商均在70以下,亦称智能不足,智能落后,或精神发育迟滞。关于智力发育成熟的年龄,一般定为18岁。 二、患病率 全世界约有一亿五千万智
First, the definition of intelligence, also known as intelligence, refers to the level of human intelligence. It includes perception, memory, observation, cognitive ability and thinking, ability to create. It can also be said that learning knowledge and skills to adapt to the environment and the ability to transform the environment. Human intelligence is gradually developed with age, so children of different ages have different levels of intelligence. Mental retardation (MR) refers to the average development of children below the same age, IQ below 70, also known as lack of intelligence, mental retardation, or mental retardation. About the age of mental development is generally set at 18 years old. Second, the prevalence is about 150 million Chileans around the world