"Dancer" is the Engpsh word for a person who performs dance as an art form or profession. The word "dancer" comes from the Old French word "danseur," which itself comes from the Latin "dansere," meaning "to dance." Here are a few examples of how "dancer" can be used in a sentence:

She's a professional dancer and has been performing in Broadway shows for years.
He's been taking dance lessons for years and is now a skilled dancer.
The dancer gracefully moved across the stage, mesmerizing the audience with her fluid movements.

In Chinese, "dancer" can be translated as "舞者" or "舞蹈演员." Here are the translations of the above sentences:

她是一名职业舞蹈演员，多年来一直在百老汇演出。
他多年来一直在学习舞蹈，现在是一名熟练的舞者。
舞者优雅地跨越舞台，令观众着迷地看着她流畅的动作。