spilt milk

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释义
无法弥补的错误；不可挽回的错误
A mistake that cannot be rectified.

例句
Fiona: So deal's a deal.
Lip: Ah, too late. Spilt milk.(Shameless)
菲奥娜：君子一言。
利普：晚了。覆水难收。（无耻之徒）