Consider the structure of the first three chapters.

并考虑,前三章的结构。

耶鲁公开课 - 政治哲学导论课程节选

And so the first three chapters take you through the history of chemistry starting with Democritus.

前三章将带你们回顾,化学的历史，由Democritus开始。

麻省理工公开课 - 固态化学导论课程节选