"To play the role of a monkey" is one way to say it in Engpsh. The phrase "play the role of" means to pretend to be or act as a certain character or thing. It comes from the world of theater and acting.

Examples:

"He is playing the role of a monkey in the school play."
"She loves to play the role of different animals in her performances."
"The actor was tasked with playing the role of a mischievous monkey in the film."

翻译：

"他在学校剧中扮演一只猴子。"
"她喜欢在表演中扮演不同的动物。"
"演员被要求在电影中扮演一只淘气的猴子。"