有人说，《开学第一课》绝对是中国收视率最高的电视节目。

全国网收视率高达4.47%，城市网破五，刷新历史最高纪录，央视霸霸的该时段收视提升了559%！毕竟第一次见电视节目放进了家庭作业里面！

今天来看看和class有关的表达有哪些？

1、表示“(学生的)班，班级，年级”：

take classes
上课

A famous art school in New York City invited him to take classes there.
纽约的一所有名的艺术学校邀请他在那里授课。

in class
上课中

Most students were not attending in class.
大多数的学生在上课中没有用心。

sit in on a class
〈美〉旁听课

Do you mind if I sit in on your meeting? 
你们的会议介不介意我旁听?

give one's class
讲课

meet one's class
授课

after class
下课后；课下

extracurricular class
课后班

training classes
培训班

interest-oriented class
兴趣班

2、表示“等级，级别；(飞机、车辆等的)舱位”：

real class
高级

top of the class
第一流的

world class
世界级，世界水平；一流的

first class
第一流；头等

second class
（大学考试成绩）二等；二等舱；二流

third class
三等；三级；三等舱

middle class
中产阶级

economy class
（飞机上的）经济舱位

business class
商务舱

be in a class of your own
无与伦比

to be the best at a particular activity=anything else of his/its kind

As a cook, my wife is in a class of her own.
在烹调方面，我妻子是没人比得上的。

be in a class by itself/of its own
独一无二

to be something of such a high quality that nothing can be compared to it=better than everyone; unequalled

Her mother's cakes are in a class by themselves.
她母亲做的蛋糕称得上是别具一格。

be out of your class
远远胜过

to be much better at doing something than you

I can't play chess with him. He's completely out of my class!
我不要和他下棋。他比我强太多了！

3、表示“阶级，社会阶级，社会等级”：

the classes
上层社会 

the upper classes
上层阶级

working class
工人阶级；劳动阶级

social class
社会地位；社会阶级

ruling class
统治阶级

class struggle
阶级斗争

4、表示“种类，类别；门类”：

class A/B/C drug
(英国)A/B/C类毒品

class A drug

N (in Britain) any of the most dangerous group of controlled drugs, including heroin, cocaine, and MDMA
(英国)A类毒品；包括海洛因、可卡因、摇头丸等毒品 [法律]

Praise is a Class A drug and we crave more and get upset when we don’t get any in sufficiently pure form.
称赞就像一种A类毒品，我们渴望“吸食”更多，但如果“纯度”不够，便会感到沮丧。

class B drug

N (in Britain) any of the second most dangerous group of controlled drugs, including amphetamine
(英国)B类毒品；包括安非他命等 [法律]

class C drug

N (in Britain) any of the least dangerous group of controlled drugs, including temazepam and cannabis
(英国)C类毒品；包括羟基安定及大麻等 [法律] 

5、表示“品位”：

have class
有品位

If you say that someone or something has class, you mean that they are elegant and sophisticated.

The most elegant woman I've ever met – she had class in every sense of the word. 
我曾见过的最高雅的女人——从各种意义上讲她都有品位。