cry over spilled milk
US /kraɪ ˈoʊvər spɪld mɪlk/
UK /kraɪ ˈoʊvər spɪld mɪlk/

1.
为打翻的牛奶哭泣, 为无法改变的事懊悔
to be unhappy about something that cannot be changed
:
•
It's no use crying over spilled milk; we just need to find a solution now.
为打翻的牛奶哭泣是没有用的;我们现在只需要找到解决方案。
•
She was still crying over spilled milk from last week's mistake.
她还在为上周的错误哭泣。