She keeps bleating about having too much work, but never tries to solve the problem.

bleating 是动词 bleat 的现在分词形式。bleat 本意是指羊"咩咩叫"，引申为"不停地抱怨"或"发牢骚"，带有贬义色彩，暗示抱怨的内容重复且无意义。