参加考研用英语表达是：Take part in the postgraduate entrance examination；

postgraduate：n. 研究生。

entrance：n. 大门(口); 入口(处); 通道; 进入; 出场; 登场; 进入权; 进入机会。

You can take part in activities from canoeing to bird watching.

你可以参与从划独木舟到观鸟等各种活动。

I was quite sulky, so I didn't take part in much.

我很烦，所以没有积极参与。

You can take part in multiplayer games either on a LAN network or via the internet.

可以通过局域网或因特网参加多人游戏。

Mrs Kerr was too upset to take part in a reconstruction of her ordeal.

克尔夫人受惊过度，不堪再参与自己所受折磨的场景重现。

Students who want to take part in this project should know the fundamentals of modern fluid mechanics.

想要参加这个项目的学生需要了解现代流体力学的基本原理。