What's done cannot be undone.

做过的事情不能逆转。

What's done cannot be undone.

做过的事情不能逆转。——《麦克白》 》。

But we can't change him, so we must make the best of it. What's done cannot be undone, on use crying over spilt milk.

我们不可能改变他，故而必须尽量处理好。 覆水难收，后悔是没用的。