痛定思痛的英文：
[Literal Meaning]
pain/calm/think/pain
to recall the past with pangs in the heart

[解释]
指悲痛的心情平静以后，再追想当时所受的痛苦，提醒下次注意。

[Explanation]
to draw a lesson from a bitter experience

[例子]
痛定思痛，我们应该认真地考虑一下如何来弥补所犯下的错误。

[Example]
We should think over the reason after this bitter lesson and consider seriously how we shall make up for the mistake.

[英文等价词]
recall a painful experience

As survivors of a disaster, we should think over the reason after this bitter lesson.
劫后余生，我们应痛定思痛。