It is very rare, for instance, for somebody who has learned English past puberty to speak without an accent.

比如,在青春期后才学习英语的人,很少有讲英语是没有口音的

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Around seven years of age going up through puberty, the ability to learn language starts to go away.

大约七岁的时候开始,一直到青春期,学习语言的能力逐渐减弱

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And once you hit puberty, suddenly there's huge variation in the abilities you have to learn language.

一旦你到了青春期,学习语言的能力会在突然间,发生巨大的变化

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