碰巧，她的生日在我的生日之后一天。

___As ___it ___happens, her birthday is the day after mine.

碰巧，我正在为自己找计算机课程，想参加你们的一个课程。

___As ___it ___happens, I am currently looking for a computer course for myself and I would like to join one of your courses.

碰巧，我们刚才正在谈论你。

___As ___it ___happens, we were just talking about you.