cry over spilled milk字面意思是“对着溢出来的牛奶哭”，可想而知，哭也没用，可以意为“覆水难收，作无益的后悔”等.

【例句】
Yes, we made a mistake, but there's no point in crying over spilled milk.
是的，我们犯了一个错误，但是作无益的后悔是没有意义的。

I know that you have lost your purse, but since it had happened, let it go, please don't cry over spilled milk.
我知道你丢了钱夹，不过既然这件事已经发生了，就让它去，不要作无益的后悔。