complain用法：
vi. 抱怨,发牢骚;诉说(病痛bai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。
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. 抱怨;控诉Y+that
He complained that the exam was too hard.他抱怨考试太难了。
词组：
complain about对……不满
complain about sth 抱怨某事
complain to sb 想某人抱怨
complain that+从句 抱怨某事
complain to sb (about sth) 向某人抱怨某事
complain of sth 诉说病痛
complains box是意见箱的意思
complain of 抱怨；抗议