[Definition] [Cambridge Dictionary] to copy the way someone speaks and moves, esp. in order to amuse or insult people.（尤为逗笑或嘲弄而）模仿（某人或其言行）

Example:

Everyone laughed when the kid tried to mimic a dinosaur.

当那个孩子模仿起恐龙的时候，所有人都笑了起来。

She was mimicking the various people in our office.

她当时在模仿我们办公室里面的各种人。

[Definition] [Cambridge Dictionary] to create conditions or processes similar to something that exists. （用计算机或模型等）模拟

Example:

This robot is designed to simulate real human emotions, like excitement, sadness, and anger.

设计这个机器人是为了模拟人类的真实情感，比如兴奋、伤心和愤怒。

Computer software can be used to simulate conditions on the seabed.

计算机软件可用于模拟海底状况。

[Definition] [Cambridge Dictionary] to copy someone’s speech or behavior, or to copy something as a model. 单纯地“复制、效仿”，也就是“模仿人的行为或事物的特征”

Example:

Kids tend to imitate adult behaviours.

孩子往往会模仿大人的行为。

My four-year-old daughter is always trying to imitate her older sister.

我四岁的女儿总是试图模仿她的姐姐。