我走进教室，老师慈祥地看着我，口气不带责备地说：“快到座位上去吧，小弗朗茨，我们就要开始上课了，不准备等你了。”

As I entered he looked at me kindly, and said, without scolding, "go quickly to your place, little Franz; we were going to begin without you."

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上课之前，我的老师准备了一些卡片。

Before the class, my teacher prepared some CARDS.

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上课前，哲学教授准备了几样物件放在讲台上。

A professor stood before his philosophy class with some items in front of him.

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I expect you to come to class prepared.

我期待你们上课前都准备好了。

麻省理工公开课 - 固态化学导论课程节选