translation.en: And it's not, but we think speech -- "My God, little children pick it up somehow, and by the age of two they're doing a mediocre job, and by three and four they're speaking reasonably well.
translation.zh: 其实不是的。 但我们认为演讲 -- 上帝呀， 小孩子们在某种程度上学会了。 但两岁的孩子在做一些平常的练习。 三四岁的时候他们说话已经慢慢不错了。