1. Which one do you want to wear, Eddie?
埃迪,你想穿哪一件?
①one 为代词,代替已知或已提过的事物(人)。
eg: I don't like this hat. Show me a bigger one.
我不喜欢这顶帽子,拿顶大点儿的给我看看。

②one与it的用法区别:one指同类,而不是同一个;it指同一个。
eg:Which book is yours, this one, that one or the one on the desk?
哪本书是你的,是这本,那本,还是桌上的那本?
I can't find my pen. Did you see it?
我找不到我的钢笔了。你看见它了吗?