笑声必然是智力发展最高程度的标志。
Laughing is an infallible sign of the highest degree of mental development.
知识环境对孩子智力的发展有着重大的影响。
The intellectual environment has a significant influence on the mental development of the children.
知识环境对孩子智力的发展有着重大的影响。
The intellectual environment has a significant influence on the mental development of the children.
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