While there,she studied the teachings of the Koran, the scriptures of Advaita Vedanta - a form of Hindu philosophy - and the poetry of 13th century philosopher Jelaluddin Rumi.

VOA: standard.2010.05.21

Do not come to your instructor and say, I've got a really good ticket but I'm leaving on the 13th.

不要去和你们的讲师说，我已经买好票了,但是我要在13号离开。

麻省理工公开课 - 固态化学导论课程节选

In 13th century India, they knew how to isolate metallic zinc.

在13世纪的印度，我们知道了如何提取金属锌。

麻省理工公开课 - 固态化学导论课程节选

But in the 13th century, the capital city,Angkor,died off, and a new scientific study indicates that climate, specifically decades of drought interspersed with intense monsoons, helped bring down the Khmer capital.

VOA: standard.2010.04.05

So much unnecessary attention around this conference had been directed towards the dispute that is unintentionally distracting from the real life and death issues we are confronted with as a country, He said it would be wrong for the controversy to overshadow the goals of the 13th international AIDS Conference.

VOA: standard.2010.05.17