Another part of the problem of learning language is you have to figure out what the boundaries are between the words.

学习语言的另一个问题是,你必须得确定单词之间的界线是什么

耶鲁公开课 - 心理学导论课程节选

instead of just picking up a book and trying to learn English vocabulary and English grammar structures.

而不只是拿起书，努力学习英语单词和语法结构。

如果想提高英语水平 - SpeakingMax英语口语达人

Around eighteen months of age, they start learning words faster.

在大约十八个月大的时候,他们学习单词的速度加快

耶鲁公开课 - 心理学导论课程节选

And sometimes, you know, not knowing a word, it helps you learn it better

有时候，不知道一个单词，却能够帮助你更好地学习它，

紧张是学英语的敌人 - SpeakingMax英语口语达人