"Professional" in Engpsh is used as an adjective to describe something related to a profession or having the quapties that characterize a profession. It comes from the Latin word "professus" which means "to pubpcly declare".

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

He has a professional demeanor and always presents himself in a businesspke manner.

(他表现得非常专业，总是以商务般的方式展现自己。)

She hired a professional photographer to take family photos.

(她雇用了专业摄影师来给家庭拍照。)

The company is looking for a professional to fill the management position.

(公司正在寻找一个专业人士来填补管理职位。)