As he tells it,one day he looked in the window of a school and noticed how dark it was.

VOA: special.2009.12.21

I remember one day, in the school there was a square.

我记得有一天，学校里有个广场。

麻省理工公开课 - 媒体、教育、市场课程节选

I remember one day, in the school there was a square.

我记得有一天，学校里有个广场。

麻省理工公开课 - 媒体、教育、市场课程节选