beat a dead horse
释义
反复唠叨：指继续谈论已经讨论或决定过的话题。
徒劳无功：指试图做不可能的事情而浪费时间和精力。
例句
1·I hate to beat a dead horse , but it is very important that you understand this before you leave.
我不想多此一举，但你离开以前必须了解这个。
同义词
白费口舌；徒劳；在已经失去意义的问题上白花力气
waste one's breathhold a candle to the sun
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