婴儿与儿童（图片上部）时期人类大脑皮层区域的扩展，与人类大脑较之猿与猴类大脑在脑区上的变化（图片下部）紧密地吻合。
Areas of expansion in the human cortex during infancy and childhood, top, closely match areas of change in the human brain when compared to the brains of apes and monkeys.
人类具有先天的语言学习能力，在儿童时期能够轻松地习得第一语言——母语，然而在第二语言学习过程中却面临着许多的困难因素。
Human beings are born with language learning ability, and they can easily acquire the first language, their mother tongue, in their childhood.
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