It is important for some classes to have exactly one instance.

重要的是，一些班级有精确的一个实例。

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Marcela Franco, who was 26, was registered for some classes at Santa Monica college.

玛塞拉·弗兰科今年26岁，在圣塔莫尼卡学院注册了一些课程。

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Most of the material in this course is based on cases. For some classes, however, we will rely on readings from two excellent books.

本课程大部分的内容皆以个案为主。然而，对于部分的课程，我们将撷取两本卓越的书籍来阅读。

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In some classes, only Spanish is spoken, even during the Pledge of Allegiance -- a morning tradition for American schoolchildren.

VOA: special.2010.06.17

Some people have argued there's a module for sociology, for dealing with human groups, races and classes and so on.

有些人认为大脑中存在一个社会学模块,用以面对各种人类团体,种族以及阶级等

耶鲁公开课 - 心理学导论课程节选

So as far as I know, I know that for some computer science classes

所以据我所知，我知道有的计算机科学课

对于未来的技术 - SpeakingMax英语口语达人

Premiums are already slipping for some classes of insurance, so the 2003 profits may turn out to have been a peak.

ECONOMIST: The Lloyd's insurance market

Georgia State University said last month that it would accept credit for some classes offered by Coursera, but the grade won't be factored into a student's grade-point average.

WSJ: Web Classes Grapple With Stopping Cheats

After signing up for some finance classes, he discovered that there were some topics he enjoyed studying.

NEWYORKER: Mastering the Machine