The English word for "主演" (zhǔ yǎn) is "star" or "lead actor/actress." This word comes from the Old English word "steorra," which means "star."

Here are some examples of "star" used in sentences:

The movie star was surrounded by fans as she walked down the red carpet.

She has been a star on Broadway for many years.

The soccer player is a star on the national team.

In these sentences, "star" is used to refer to a person who is famous or notable for their work in a particular field, such as acting or soccer.