英语单词one是我们再熟悉不过英文了，它既是数字1，又能强调某一个人，还能延伸出很多有趣的短语和含义，快来了解一下吧！
1. At one time 同时；曾经；从前；
At one time she must have been a handsome woman.
她从前一定是一个漂亮的女人。
2. Number one 头号人物(或事物)；最重要的人(或事物)；最好的人(或事物)
Well, I think number one is curiosity. It’s the most powerful thing you own.
我认为最重要的是好奇心，这是你拥有的最强大的东西。
3. Pull a fast one 欺骗
Don’t listen to her – she’s trying to pull a fast one on you.
别听她的，她试图欺骗你。
4. Be/go back to square one 退回起点；从头再来；
It seems our plan is bad, so its time to go back to square one.
看起来我们的计划不行，是时候回到起点了。
5. One and only 唯一的；独一无二的；绝无仅有的；
You are my life. You’re my one and only dream.
你就是我的全部，你是我唯一的梦想。
6. Look out for / Take care of number one 为自己打算；替自己着想；
She knows how to look out for number one.
她知道怎么去为自己考虑。
Take care of number one means to put your own interests first.
照顾自己意味着把你自已的利益放在首位。
7. One in a million 万里挑一；佼佼者；
I want to introduce you to a person who is one in a million.
我要给你介绍的人，那可是万里挑一的。
8. One good turn deserves another. 礼尚往来；善有善报；
If he does you a favor, you should do him a favor. One good turn deserves another.
如果他帮你的忙，那么你也该帮他的忙，礼尚往来嘛。
9. Roll up into one 合为一体；兼于一身；
She is a great person — kind, thoughtful and intelligent — all good qualities rolled up into one.
她是个很优秀的女人——善良，体贴，聪慧——集所有可贵品质于一身。