抱怨者

例句：

1. 1. The manager is alwayscomplaining about the slow service.
   经理总是抱怨服务慢。
2. 2. She was a complainerbefore she retired.
   她退休前是个抱怨者。
3. 3. He's a complainer whoalways finds fault with everything.
   他是个总找茬的抱怨者。