That will be the day! 会有那么一天吗?
That will be the day是一个用得非常普遍的习惯用语。That will be the day美国人用这个习惯用语已经有四十多年了。还带有浓厚的讽刺性。
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,老板又向我们保证要给我们加工资。可是,他以前也这么保证过,然后又找借口不给加。这次,他说,到一月一号,我们就可以加不少工资。 哼,谁信他的!恐怕这根本不会实现。