When something hurts you all of a sudden — you bang a toe, a needle goes in, you burn a finger — the sound that jumps out of your mouth is "ouch." You do not plan it. It is a cry. People say it in real life, often a bit loudly, and writers put it in comics and children's books so you can hear the pain on the page.

When something hurts you all of a sudden當有東西突然弄痛你——you bang a toe你撞到腳趾、a needle goes in打針、you burn a finger燙到手指——the sound跳出你嘴巴的那個聲音 that jumps out of your mouth is "ouch."就是「ouch」。You do not plan it你不是刻意講的。It is a cry它是一種驚呼聲。People人們 say it in real life在現實生活中真的會這樣講，often a bit loudly常常還講得有點大聲，and writers而作家們 put it會把它放進 in comics and children's books漫畫和童書裡，so you can hear the pain on the page好讓讀者在紙上也能感受到那份痛。

You can also say it in a small, joking way when the hurt is light, or when you hear a story that sounds painful: "Ouch. That must have hurt." English has other pain sounds too (ow, oww); "ouch" is the one you see most in writing.

You你 can also say it還可以用 in a small, joking way小小開玩笑的方式來講，when the hurt is light在傷得不重的時候，or when you hear a story that sounds painful或是聽到一個聽起來很痛的故事時："Ouch.哎喲。 That must have hurt."那一定很痛。 English英文 has other pain sounds too還有其他表達痛的聲音（ow, oww），"ouch"「ouch」 is the one you see most in writing是書寫裡最常見的那個。

It is informal. You would not put it in a serious letter.

It is informal它是個口語用字。You你 would not put it不會把它放進 in a serious letter一封正式的信裡。