各位同学 is the way to say "everyone" or "classmates" in English. It is a literal translation of the Chinese phrase, and it is commonly used in formal or academic settings.

Here are some examples of how to use it in a sentence:

"各位同学，请大家看到这个幻灯片。" (Everyone, please look at this slide.)

"各位同学，我们今天讨论的话题是伦理学。" (Classmates, the topic of our discussion today is ethics.)

In both of these examples, 各位同学 is used to address a group of people in a formal or academic setting. It is a polite and respectful way to address a group of people, and it is often used in conjunction with other polite phrases such as 请 (please) or 大家 (everyone).