That will be the day! 會(huì)有那么一天嗎？

That will be the day是一個(gè)用得非常普遍的習(xí)慣用語(yǔ)。That will be the day美國(guó)人用這個(gè)習(xí)慣用語(yǔ)已經(jīng)有四十多年了。還帶有濃厚的諷刺性。

Sure, the boss promised us a raise again, but he's done that before and then finds some excuse not to do it. This time he said we can expect a nice raise by January 1. Yeah, sure - that will be the day！ We're afraid it just won't come true!

是呀，老板又向我們保證要給我們加工資。可是，他以前也這么保證過(guò)，然后又找借口不給加。這次，他說(shuō)，到一月一號(hào)，我們就可以加不少工資。 哼，誰(shuí)信他的！恐怕這根本不會(huì)實(shí)現(xiàn)。