He often had four classes of 80 kids each.

他经常有四个班，每个班八十个孩子。

It " has the potential to eliminate an entire class of patents. "

它" 可能将消除整个专利类别" 。

They have also separated the classes of girls and boys.

他们还将女孩和男孩的班级分开。

By the mid-1980s, no new chemical classes of antibiotics were discovered.

截止到 1980 年代中期，已经没有新的抗生素化学类别被发现。

That no magics to be used between the classes of the corridors.

课间不要在走廊里施魔法。

Kids are separated into classes of different abilities.

孩子们被分到不同能力的班级中。

Nature isn't as picky as we are about having narrowly-defined borders between classes of objects.

自然并不像我们那样挑剔，我们的分类中，对象的类别之间的定义边界十分狭窄。

Presently, however, I found that he had many acquaintances, and those in the most different classes of society.

可是，不久我就发现他有许多相识，而且是来自社会上各个迥然不同的阶层的。

Class of 2019, our society is yours to change.

2019届毕业生们，我们的社会将由你们改写。

The design of William Robert Ware, class of 1852，and Henry Van Brunt, class of 1854, was selected.

1852年毕业的威廉姆·罗伯特·威尔和1854年毕业的亨利·凡·布朗特的设计很幸运地中标了。

A Thursday afternoon class of my childhood.

我小时候在一个周四下午的一节课。

This is a class of mixed abilities.

这个班级里的学生水平不一。

One class of drugs is called uppers.

一类毒品被称为兴奋剂。

God bless the class of 2020.

上帝保佑2020届毕业生。

There are three main classes of drugs, each of which has a different effect on the body.

主要有三大类的毒品，每一种对身体的影响不同。

DeSantis argues that vaccine passports reduce individual freedom and would create two classes of citizens based on vaccination.

德桑蒂斯认为，疫苗护照减少了个人自由，并在疫苗接种的基础上将公民分为两类。

And it banned an entire class of weapons.

条约禁止同一类级别的所有武器。

There is also a class of object called meteoroids.

还有一样东西称为“meteoroids（流星体）”。

But most of all, congratulations to the class of 2018.

最重要的是，我要恭喜2018届的各位毕业生们。

It may accelerate because we'll have new antibiotics as well as new classes of antibiotics in the future.

它可能会加速，因为我们将来会有新的抗生素以及新的抗生素种类。