"that'll be the day" in Chinese (Simplified)

到那天吧（表示怀疑）- 等到太阳从西边出来

Definition

这个表达用来表示某事非常不可能发生，常带有讽刺意味。

非正式表达，多用来幽默或讽刺地回应不太可能发生的事。类似“太阳从西边出来”这样的中文说法。

"You think he'll wake up early on a Sunday? That'll be the day!"

“你觉得他会在星期天早起？**到那天吧！**”

If she ever apologizes, that'll be the day.

她要是有一天道歉，**等到太阳从西边出来吧！**

"Mom, will you buy me a car?" "That'll be the day!"

“妈妈，你会给我买辆车吗？” “**到那天吧！**”

He said he's going to quit junk food and start running every day. That'll be the day!

他说要戒掉垃圾食品，每天跑步。**等到太阳从西边出来吧！**

If they ever agree on anything, that'll be the day.

他们要是哪天能达成一致，**到那天吧！**

Oh, you're going to stop teasing your little brother? That'll be the day!

你说你不会再逗你弟弟了？**到那天吧！**