Speaking just hours before the start of the G20 meeting of major economies, Mr.Obama stressed the need for all participants to seek common ground.

VOA: standard.2009.04.01

Before that the United States went through repeated banking crises when people would start demanding the gold for their notes.

才有了中央银行，在这之前,当人们向银行索要金子来兑现他们的纸币时,美国经历了一次又一次的重蹈覆辙的银行业危机。

耶鲁公开课 - 金融市场课程节选

The beginning of fall semester, actually right before classes start,

秋季学期开始，实际上就是在开始上课之前，

加入女生社团 - SpeakingMax英语口语达人

"Having said that, one of the tricks here is to try and get something done in time for the legislative process - that is the United States Senate and the Duma in Russia - to approve whatever they do before the START-1 treaty expires in December,".

VOA: standard.2009.04.08

All right. So before we start in with today's notes, I do want to mention that this morning the Nobel Prize in chemistry was announced.

好的，在开始今天的课之前，我要说一下今天早上,公布了诺贝尔化学奖。

麻省理工公开课 - 化学原理课程节选

It was the same town where abolitionist John Brown had tried to start a slave rebellion a few years before.

VOA: special.2009.08.20

Before we start on the trip, I want the children to know where in the world they are and where they've come from.

在我们开始旅行前，我希望孩子们知道,他们在世界的那个位置,他们来自哪里。

麻省理工公开课 - 媒体、教育、市场课程节选

They demand that Israel freeze all construction on Jewish settlements in the occupied West Bank before any negotiations start.

VOA: standard.2009.10.31

What we're saying is, in order to do computation, we want to describe recipes, we want to describe this sequence of steps built on some primitives, and we want to describe the flow of control that goes through those sequence of steps as we carry on So the last thing we need before we can start talking about real programming is, we need to describe those recipes.

我们在说，为了做计算，我们想描述一个方法，想描述建立在,相同基本类型上的步骤序列，而且我们想描述经过我们设计的,步骤的序列的，控制流程,因此我们开始谈论真正的编程之前,的最后一件事是，我们需要描述一下那些方法。

麻省理工公开课 - 计算机科学及编程导论课程节选

He always puts his right ski boot on first, he touches his helmet and goggles two dozen times before leaving the start house.

VOA: standard.2010.02.09

You've got to spend the time to make sure that everything is well defined before you start trying to work out these problem More about the path. There are a couple ways you could go through that pass If I look at this smooth path here.

你要花时间确认,在你开始尝试解题前,切已经被很好地定义,关于路径还有些问题,你可以用两种不同的方式经过这条路径,看这条平滑的路径。

麻省理工公开课 - 热力学与动力学课程节选

At Northwestern University, researchers recently concluded that well before babies start to speak, they recognize words and can link them to the things they represent.

VOA: standard.2010.05.05

The water soluble vitamins tend to be used more immediately by the body not stored and excreted through the urine if consumed in excess, so the body can tolerate more variation in intake of these before you start getting toxicity than is the case with the vitamins on the right.

而水溶性维生素往往都立刻被身体所利用,不会被机体储藏,过剩部分由尿液排出,因此机体耐受过量水溶性维生素的能力,相比起右边这栏里的脂溶性维生素,可是要强得多了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

We are going to get there the day before the games start two days before. And it's all about building, and getting better every game and that is how the team is going to win.

VOA: standard.2010.01.12

So before, because of all these anti-business rhetoric, once you start intervene, s not just the question of the merit of the particular intervention, s the fact that nobody knows ll be intervening again.

所以之前，因为反商业言论，一旦你开始干预，问题就不仅仅在于，it’,某一桩干预事件的好处，而是没人能预料，it’,政府何时又会出手，when，you’

斯坦福公开课 - 经济学课程节选

I think as the series goes on he accepts more and more that he is part of the contemporary world and I think all the things that were deemed to be flaws before start fading away.

VOA: standard.2010.07.07

Oh, and actually before you skip your page in the notes, I realized I should write out for you what the addition is to start with. So, when we're combining two waves, 1sb what we have is 1 s a that we're adding together with 1 s for b, the second atom.

在你们翻过这页讲义之前，我觉得我应该写出加法,当我们把两个波函数放在一起时，我们用1sa加上，第二个原子。

麻省理工公开课 - 化学原理课程节选