Review all the lessons in this unit and see if you can understand the main idea of each lesson.

复习这个单元的所有课文，然后看看你们是否理解每篇课文的大意。

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For example, when you buy English lessons from Showay English, we will tell you that you must study that one lesson at least 30 days, one full month, for a unit.

例如，你从韶唯英语购买课程，我们会告诉你一节课一个单元的内容你必须学习至少30天以上，整整一个月。

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Second, preview every unit before the lesson.

第二，预览各单元在课。

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And as I'm going to do many times in 3.091, I'm going to start a unit like this with a history lesson.

在3。091这门课上我会重复很多次，我会像现在一样以一个历史的故事,来开始新的一单元。

麻省理工公开课 - 固态化学导论课程节选