Gregg Easterbrook writes a weekly piece called "Tuesday Morning Quarterback" for E.S.P.N.com.

VOA : special.2010.02.05

He urged revival of the slave-trade in the late 1850s, and he developed a theory of what he called warranteeism--w-a-r-r-a-n-t-e-e-I-s-m.

他促成了十八世纪五十年代后期,奴隶交易的复苏,还自己发明了一套理论,名为抵押品主义

美国内战与重建课程节选 : 耶鲁公开课

We can go all the way down -- magnesium aluminum, all the way to this noble gas, 3s23p6 argon, which would be n e and then 3 s 2, 3 p 6.

我们可以继续，镁，铝,一直到惰性气体，氩它是Ne然后。

化学原理课程节选 : 麻省理工公开课

The address is u-s-a-l-e-a-r-n-s dot o-r-g.

VOA : special.2009.01.15