vi.

1. 抱怨，发牢骚；诉说（病痛等）[（+to/about/of）]
   I've really got nothing to complain of.

   我确实没有什么可抱怨的。

   He complained to me about the food.

   他向我抱怨伙食不佳。

2. 控诉，投诉[（+to/about/of）]
   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。

vt.

1. 抱怨；控诉[Y][+that]
   He complained that the exam was too hard.

   他抱怨考试太难了。

v.

1. express dissatisfaction or annoyance.
2. (complain of) state that one is suffering from (a symptom of illness).