behavior 是 behaviour 的美式拼法，意思一樣。多益（TOEIC）用美式拼法。
behavior · behaviour
核心畫面
Picture watching someone from across the room without hearing a word they say. What you can still see — how they treat people, what they do when things go wrong, the pattern that repeats — is their behaviour. The word points at the outside, not the inside: not what someone feels or intends, but what actually shows. That is why science can borrow it for materials and animals too; anything that acts in an pattern has behaviour.
可以想成 behaviour 是這樣的畫面：你在房間另一頭看著一個人，一句話都聽不到，但你還是看得出來——他怎麼對別…更多收起
可以想成 behaviour 是這樣的畫面：你在房間另一頭看著一個人，一句話都聽不到，但你還是看得出來——他怎麼對別人、事情不順的時候他做什麼、哪些反應一再出現。這些看得到的部分就是 behaviour。這個字指的是外面，不是裡面：不是他心裡怎麼想、想幹嘛，而是實際顯現出來的樣子。也因為這樣，科學也借去用在動物和材料上——只要會以某種看得出來的方式作用，就有 behaviour。原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
behaviornoun/bɪˈheɪ.vjə/
- 1
Human conduct relative to social norms.
- Teachers will probably be on their best behaviour for your visit – but don't be upset if they don't even notice you; they've got enough going on.
- 2
An inappropriate or forbidden action.
- When a patient has a behavior, document it in their records.
- 3
The way or manner a living creature behaves or acts generally.
- 4
informalA state of probation about one's conduct.
- He was on his best behavior when her family visited.
- 5
biologyhuman-sciencesnatural-sciencesAn observable response produced by an organism.
- 6
The way a device or system operates.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。