complaint/ kəm'pleɪnt /

1.noun [c] 
(criticism) 抱怨

2.noun [u] 
(complaining) 投诉

3.noun [c] 
(reason for complaining) 抱怨的原因

4.noun [c] 
(illness) 疾病

to make a complaint (to sb)
(向某人)投诉