The boy said that he dropped out of school after reaching Level 3, and could not find any job . Thus, someone introduced him to the business.

法官问他这么做的原因，男孩说他在3年级的时候从学校退学，找不到任何工作，有人介绍他干这个生意。

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And we'll talk about that and that's what Chapter 3 is about.

我们会在学习第三章时做进一步介绍

耶鲁公开课 - 生物医学工程探索课程节选