俚语：Cry over spilled milk/为不可挽回的事烦恼

　　定义：to express grief about something which is unalterable or irreparable对不可改变或不可挽回的事表示悲伤

　　例句：I had to admit the fact that the ring was lost for good, and there was no use in crying over spilled milk.我必须接受戒指遗失的事实，对这事表示哀伤是没有用的。