The division of students into different classes according to their grades might cause some problems, such as hurting the pride of some students whose grades are not so good.

根据成绩将学生分成不同的班级可能会导致一些问题出现，如伤害一些成绩不太好的学生的自尊。

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The letters refer to different classes.

这些字母表示不同的类别。

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According to the speed, Chinese trains are divided into different classes, identified (确认) with different letters and numbers.

中国的列车根据速度可分为不同类别，以不同的字母和编号区分。

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Ms.Chapple-Brown says the school also offers one hundred forty different classes in sustainability and the environment.

VOA: special.2011.07.08

On one level, there are things like companies that have two . different classes of stock that are economically identical.

一方面，我们有这样的例子，有的公司拥有两种,不同类别的股票，他们在经济意义上是相同的。

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So in fact, over the next thirty or forty minutes we're going to show you a set of examples of sort of canonical algorithms, and the different classes of complexity.

在接下来的三四十分钟里面,我们将要讲一系列的,权威算法，以及不同种类的复杂度问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

The point is that ordinary folk and the 1% are not different classes of people.

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However, a recapitalization producing different classes of voting stock in a family company can often work well.

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As in many urban environments, there is strife between the different classes of commuters in this city.

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