Cry over Spilt / Spilled Milk 浪費時間做無能為力、于事無補的事情

S：We did all we could for them.

I told him I had my eye on him as a possible underbutler in a year or so.

But... no, Mr. Charlie knows best.

M：She’s sure to be let down.

S：No use crying over split milk. Besides, we have far more important matters to discuss.

Next week’s meeting. As you know...

M：Must we discuss it tonight?