"Playing the role of a monkey" in Engpsh is expressed as "portraying a monkey."
The term comes from the practice of actors in a play or performance assuming the persona and characteristics of a particular character, in this case a monkey.
Example sentence:
"He was hired to portray a monkey in the circus performance."
他被雇用扮演马戏表演中的猴子。
Example sentence:
"She enjoyed portraying different animals, including monkeys, in her acting roles."
她喜欢扮演不同的动物，包括猴子，在她的演艺生涯中。