the first time和a first time是不是都翻译成第一次 有什么区别?

the first time和a first time是不是都翻译成第一次 有什么区别? for the first time和the first time和at the first time有什么区别? the first time 和 for the first time 有什么区别?是不是有个相当于when的' for the first time,the first time有什么区别 the first time 和at the first time有什么区别 for the first time 和 the first time 有什么用法区别? at the first time和for the first time有什么区别 at first time 和for the first time 有什么区别 For the first time和The first time的区别 once time 和 first time 有什么区别、 at the first time和at first time 的区别? the first time 和at the first time和for the first time的区别