This week in our series, Warren Scheer and Sarah Long continue our story of the Compromise of Eighteen Fifty.

VOA: special.2009.04.02

In this case, the basic column of air is twelve and a half feet long and there are something called "Partials" or the "Harmonic series" That happens in anything, on a string instrument or whatever, but on the horn it's very distinct and that's what makes the different notes.

像这样,基本空气柱有十二个,每个半英尺长,圆号能发出分音,或泛音列,弦乐器或是,其他别的乐器中都有,但在圆号上,效果相当不同,这就是它能奏出不同音符的原因

耶鲁公开课 - 聆听音乐课程节选

Now, to be sure, in Siberia in the far reaches of the north, North Asia, this empire amounted to little more than a series of trading posts, and it took a very long time for any semblance of Russian authority from Moscow and soon from St. Petersburg, for reasons that we'll see, to reach there.

现在,可以肯定,当时的俄国,在西伯利亚和北亚并没有多少商栈,俄国耗费了很多时间,才使得其首都市容变成现在这样,无论是莫斯科,还是之后的圣彼得堡,原因我们会讲到

耶鲁公开课 - 欧洲文明课程节选

This week on our series, Sarah Long and Richard Rael discuss relations between the Mormons and the federal government.

VOA: special.2009.06.04

This week in our series, Rich Kleinfeldt and Shirley Griffith tell more about the long disputed issue of slavery and the Kansas-Missouri bill.

VOA: special.2009.04.30

This week in our series, Steve Ember and Sarah Long tell about some of these conflicts.

VOA: special.2010.04.01

Long before the "Twilight" series, writer Anne Rice created another popular series of vampire books.

VOA: special.2010.01.20