I graduated at the top of the class with full honours.

我以优异的成绩毕业，在班上名列前茅。

attend evening classes / dancing class

上夜校/上舞蹈课

We were expected to write an in-class essay about the topic.

我们被要求写一篇关于这个话题的课上作文。

the lower / middle / upper class

下层阶级/中产阶级/上层阶级

Class means a person’s economic position in society.

阶级意味着一个人在社会中的经济地位。

Members of the working class have blue-collar jobs.

工人阶级做“蓝领”工作。

first / business / economy class

头等舱/商务舱/经济舱

Lang Lang is a world-class pianist who grew up in Shenyang.

郎朗在沈阳长大，是一位世界级的青年钢琴家。

Given time, he’ll make a first-class tennis player.

假以时日，他会成为一名一流的网球选手。

Whales are classed as mammals.

鲸被归入哺乳动物。