1. 抱怨，诉苦，发牢骚 

For my own part, I have nothing to complain of / about.  

我这方面没有什么好抱怨的。  

He complained that the exam was too hard.  

他抱怨考试太难了。   

2. 申诉，投诉，控诉，抗议  

He complained to the police of the boys stealing his apples.  

他向警方控告那些男孩偷他的苹果。