What’s eating you?

　　Peter: You don’t seem happy today. What’s eating you?
　　Jack: We’re having a math test tomorrow, but I’m not ready for it yet.
　　eat在这里可不是“吃”的意思，而是“使困扰；使不开心”。而What’s eating you?就表示“你怎么了？什么事让你不开心？”