But he said the most urgent threat facing the world today is stopping Iran from obtaining nuclear weapons.

VOA: standard.2009.09.24

What I am talking about today, I will not be testing you, but maybe you might pay attention because about a month from now we will ask you a few skill testing questions about it.

我说的是今天，我等会不会测试你，但是你可能会重视了,因为一个月之前,我们问了你关于一些测试的技能。

麻省理工公开课 - 固态化学导论课程节选

But I want to begin today with another passage, from the war years, and ask now from a Northern point of view, how do we get to Uriah Parmelee?

但是今天我要以另外一篇文章做开始,自开战那年,从北方角度来看,我们要如何理解乌利亚·帕米利

耶鲁公开课 - 美国内战与重建课程节选

This is what's called the Bohr radius, and we'll explain - hopefully we'll get to it today where this Bohr radius name comes from, but for now what you need to know is just that it's a constant, just treat it like a constant, and it turns out to be equal to or about 1/2 an angstrom.

它叫做玻尔半径，我们后面会解释,希望我们今天可以讲到,波尔半径这个名称的由来，但现在你们只要记住,它是一个常数，只要把它当做一个常数对待，它等于,或者是1/2埃。

麻省理工公开课 - 化学原理课程节选