Definition
used to inquire why someone appears angry or upset.
什么事让…心烦？
She seems really down today, I wonder what's eating her?
她今天看起来很沮丧，我想知道是什么在困扰她？
He's been irritable since morning, I wonder what's eating him?
他从早上开始就很烦躁，我想知道是什么在困扰他？
You look preoccupied today, what's eating you?
你今天看起来心事重重，是什么在困扰你？