Another critical factor for us is learning.
对我们来说，另一个关键因素是学习。
Practice is a critical factor in learning a language.
练习是学习一门语言的关键因素。
What we see here is that language has a critical period for learning.
这儿我们看到有个学习语言的关键期。
What we see here is that language has a critical period for learning.
这儿我们看到有个学习语言的关键期。
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