Today,we travel far and wide to learn about some of the rarest languages in the world.

VOA: special.2009.12.02

There has never been a regime in history that was so single-mindedly devoted to the end of producing that rarest and most difficult species of humanity called simply philosopher.

历史上从没有一个政体,会如此专一地致力于,催生最稀有,最难得的人类物种,即哲学家。

耶鲁公开课 - 政治哲学导论课程节选

He has been called the rarest creature on Earth.

VOA: special.2009.12.16