In two thousand six, Defense Secretary Robert Gates advised President George W.Bush to base a missile defense system in Europe.

VOA: special.2009.09.19

I'd only have 16 possible two base sequences, that's not enough to specify over 20 amino acids.

如果两个碱基一组那一共只有十六种组合,不够和二十种氨基酸来一一对应

耶鲁公开课 - 生物医学工程探索课程节选

Notice if I'm going to have two different sub problems I need to have two base cases here to catch this. And if I only had one it would error out. And as a consequence, I can go off and ask about rabbits. Let's see.

我需要定义两个基础事件来处理它,如果我只有一个基础事件的话就会产生错误,这样我就能够知道到底有多少只兔子了,让我们来看看，在第12个月末,没那么简单，在第二年末兔子就很多了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Oahu served as the command base for American operations in the Pacific during World War Two.

VOA: special.2009.03.02

What's happened actually if we base it in the last 25 years since the early '80s We've just had two recessions and they've been very mild by historical standards and...two--now three long expansions in between.

实际上是什么情况呢,80年代初期以来，这25年当中,我们只经历过两次经济衰退,而且在历史上算是相对轻微的,其间则是两，三次长时间的经济增长。

斯坦福公开课 - 经济学课程节选

One time,after World War Two ended, he brought his radio show to soldiers waiting at a base in California to return to civilian life.

VOA: special.2009.03.09

The DNA molecule here has been spread apart, opening up two single stranded DNA's which have complementary base sequences because they were double stranded DNA.

这里DNA分子被分开,形成两条单链DNA,这两条单链碱基序列互补,因为它们是由双链DNA解旋形成的

耶鲁公开课 - 生物医学工程探索课程节选

The two astronauts explored an area that they called Tranquility Base. Lack of space in their lunar spacecraft,the Eagle, forced them to leave equipment on the surface.

VOA: special.2010.03.02

If I'm talking about two DNA strands and they differ only in one or two base pairs they won't be exact complements and they won't form this double helix.

假设有两条DNA单链,有一两个碱基不能配对,它们就不能完全互补,也无法形成双螺旋形结构

耶鲁公开课 - 生物医学工程探索课程节选

The panda genome has about two billion five hundred million base pairs.

VOA: special.2010.01.19

Listeners on Earth heard the countdown from Tranquility Base: "Three,two,one .

VOA: special.2009.07.15

A car bomb explodes outside a small NATO military base in Afghanistan's southern Kandahar city, wounding two Afghans and destroying several cars.

VOA: standard.2010.05.28

Then in September, two explosive-laden vehicles penetrated the base of the African Union peacekeeping mission in Somalia,known as AMISOM, resulting in the death of 17 peacekeepers.

VOA: standard.2009.12.05

Among the dead is the top An eyewitness at the Mogadishu airport, which is situated next to the AMISOM base, says the two cars entered the compound and then exploded near the petrol station located in the base.

VOA: standard.2009.09.17