What grew as the pet project of Mark Zuckerberg, when he was a student at Harvard,has exploded - gaining eight new users ever second for the past 15 months.

VOA: standard.2010.07.23

Yeah, we've been student teaching for the past couple of months.

教过，过去几个月我一直在教学生。

我的梦想是当教师 - SpeakingMax英语口语达人