He learned to play the harmonica by watching an old man play the instrument.

VOA: special.2010.06.13

Okay we'll continue this learned man.

下周，Okay，，next，week,我们再继续讲述这位有学问的巨人。

耶鲁公开课 - 政治哲学导论课程节选

Rudolf learned more about the old man.

VOA: special.2010.05.08