Doctors say it is common for heart patients to need new stents over time.

VOA: special.2010.02.17

Then there are certain holy days: and they are separated and demarcated from common time by special rules that mark them as different.

然后是一些神圣日：,和普通的时间,被一些特殊的判定它们不同的规则所区分开。

耶鲁公开课 - 旧约导论课程节选

And it turned out that another, not quite as deadly, but still very serious disease called syphilis was also common in this part of the world at that time.

现在已知另外一种疾病,它并不完全致命但也很严重,它叫梅毒,在那时的一些地方也很常见

耶鲁公开课 - 生物医学工程探索课程节选

Both countries were isolated regionally and at that time shared common foes, Syria in particular.

VOA: standard.2009.10.27

We are basically committed to each other for sex but it's very hard to make those relationships last a long time because we might not have anything in common, we might not share anything with each other, we might not trust each other, we are not particularly bonded to each other.

我们基本上只有激情的承诺,长时间维持这种关系很困难,因为可能双方没有任何共同点，没有共享的东西，我们可能互不信任，不是特别亲近。

耶鲁公开课 - 心理学导论课程节选

If the Nairobi summit is successful, the Copenhagen talks will mark the first time Africa will be entering the global climate change negotiations under a common position.

VOA: standard.2009.10.13

In my in my area of research, it's common for us to want to process about 100 images a second in order to get real time display. Each image has about a million elements in it. I 've got to process about a half a gig of data a second in order to get anything out of it.

在我们的研究领域内，我们经常要在一秒钟内处理大概,100张图片以获得实时显示,每个图片大概包括了100万像素,因此我必须在1秒内,处理半个G的数据,来获取我想要的。

麻省理工公开课 - 计算机科学及编程导论课程节选

"Most Americans wanted to hear president tell Speaker Pelosi, Majority Leader Reid, and the rest of the Congress that it is time to start over on a common sense, bipartisan plan focused on lowering the cost of health care while improving quality."

VOA: standard.2009.09.10