Ow is the little cry people make when something hurts all of a sudden — a pinch, a knock, a stubbed toe. It is not a real sentence; it is a sound we write down.

Ow這個字 is是 when something hurts all of a sudden突然痛起來時 — a pinch, a knock, a stubbed toe（像被捏一下、撞到、踢到腳趾）， people make人發出的 the little cry那個小小的叫聲。It is not a real sentence它不是一個真正的句子； it is a sound we write down而是我們把它寫下來的一個聲音。

It is very informal, used by children and adults alike, often with an exclamation mark: Ow! It is close to ouch, which is a bit more of a full word; ow is shorter and sharper. You would not write ow in a formal letter.

It is very informal這個字很口語， used by children and adults alike大人小孩都會用， often with an exclamation mark: Ow!常常還加驚嘆號寫成「Ow!」。It is close to ouch它跟ouch很像， which is a bit more of a full word ouch比較像一個完整的字； ow is shorter and sharper ow比較短、比較尖銳。in a formal letter正式書信裡 You would not write ow不會寫ow。

People also stretch it — Ow, that was stupid of me — when the pain is small, or even when they are only surprised. Though actually, in careful writing, oh (the surprise sound) and ow (the pain sound) are different, and mixing them up makes the feeling wrong.

People also stretch it人們也會把這個字延伸使用 — Ow, that was stupid of me —（像「Ow, that was stupid of me唉，我剛剛真蠢」）， when the pain is small在痛得不嚴重的時候， or even when they are only surprised或甚至只是嚇一跳的時候。Though actually不過事實上， in careful writing在講究的寫法裡， oh (the surprise sound) oh（驚訝的聲音） and ow (the pain sound)和ow（痛的聲音） are different是不一樣的， and mixing them up把兩個搞混 makes the feeling wrong會讓語氣的感覺不對。