振作起来！

A: What's wrong with you?

B: I lost the badminton match.

A: Cheer up! It's not the end of the world.

输掉乒乓球比赛令人沮丧，Cheer up 是“高兴点儿”、“振作起来”的意思。它通常用来安慰、鼓励或给人加油。