中文： 悲伤要适可而止。 即：请节哀顺变。

I think that it means - do not worry.

it means too, no use crying over spilt milk. Don't ever regret what can not be undone or rectified. Eg.: "The papers you wanted went out in last week's trash, so don't cry over spilt milk.". Find out other idiom or proverb in english in Idiom Dictionary or surfing in the internet. Hope help you. Good luck!!

hi lilliancat, it means as i think ... sadness that you feel about something because you wish it had not happened or that you had not done it.