In my school, every grade has three classes.

在我的学校，每个年级有三个班。

youdao

Every one of the participants, ranging from an Illinois state senator to a Massachusetts minister, tested positive for all three classes of pollutants.

从伊利诺伊州参议员到马萨诸塞州的部长，所有的参与者都检测出三种污染物呈阳性。

youdao

To attach the preparatory to the senior school these three classes were known officially, on speech days and in reports, as upper, middle, and lower second.

作为高中的预备班，在演讲日和报告中，这三个班被正式称为上、中、下二班。

youdao

Students in the three-year program at Bates College in Lewiston,Maine, take more classes each semester than the other students.

VOA: special.2009.07.23

And since the city, you remember, is simply the soul at large, the three classes of the city merely express the three parts of the soul.

而因为城市，简言之，即是灵魂的放大版，城市的三个阶级,因此即代表着灵魂的三个部份。

耶鲁公开课 - 政治哲学导论课程节选

I had a behavioral economics teacher named Thomas Leonard who I took, I think, three classes from and I really enjoyed that.

我有一位行为经济学的老师叫托马斯·伦纳德，我想，我上了三次课就喜欢上了他。

我尊敬的教授 - SpeakingMax英语口语达人

The problem is that in Brazil the law effectively divides drugs into three classes.

FORBES: Internet Drugs

Until now, the Pentagon has divided foreigners into three classes for the sharing of defence information.

ECONOMIST: European aerospace

And the SNP has focussed on education, pledging to reduce the size of primary one to three classes.

BBC: Parties take to the streets