老师让学生两人一组读课文。

The teacher lets students read the text in pairs.

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下一组读。

The next group.

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以及在该运动台面的相对侧设有单支的绝对式光学尺及两组读头。

The opposite side of the moving surface is provided with a single absolute type optical rule and two groups of read heads.

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So, if you look in chapter one, you will find these definitions for different atomic groupings starting down here with the elements and moving through up through complex matter.

如果你们读第一章，你们会发现不同的原子组的定义,从底下开始有一些基本原理,往上还有复杂的物质。

麻省理工公开课 - 固态化学导论课程节选