正確表達
That'll teach you.
會讓你長記性的
(該長點心了~)
that'll teach sb
used to say that a person should avoid doing something bad in the future thanks to the experience of the effects of their actions
這下（某人）該知道（做某事的）後果了，這下（某人）該知道（不應做某事了）
它使用的場景是這樣的：
You can say this after something bad has happened to someone who should have been more careful, or should have known better.
你可以在某人發生了不好的事情之後，這件不好的事情是他本來應該更小心，或者應該更清楚的時候說這句話。
A: Oh no! Someone's stolen my phone!
噢,不!有人偷了我的手機
B: That'll teach you! I told you not to leave it on the table, didn't I?
長點心吧!我就跟你說過不要把它放在桌子上，不是嗎?
He was late again so he didn't get the bonus. That'll teach him.
他又遲到了，所以沒得到獎金，這下該長點心了。
其他表達：
use your head
動動腦子
use your head
used to tell someone in a slightly angry way to think more carefully about what they are doing
(略有些生氣地告訴某人)動動腦子
例：
We'll have to use our heads if we're going to have any hope of solving this supply issue.
要想有解決供應問題的希望，我們就得長點心了。