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

You have to use sound signals to figure out the boundaries between the words.

你必须要用声音信号,来确定单词之间的界线

耶鲁公开课 - 心理学导论课程节选