But traditional guidelines say not to use tPA if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.08.12

So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

麻省理工公开课 - 化学原理课程节选

The bill was passed, and within five months after the bill was passed, we had double digit unemployment for the first time.

法案顺利通过，法案通过后五个月，失业率就达到了两位数,是史上第一次。

斯坦福公开课 - 经济学课程节选

The first heart I made was when my mother was extremely ill and after she passed away I made the heart larger.

VOA: special.2009.09.16

So we'll see that, OK, we passed the first smoke test.

所以我们会看到，我们通过了第一个发烟测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

This is the first time scientists have successfully passed on a foreign gene to a future generation.

VOA: special.2009.06.23

So, if you were someone that was getting it after it had been passed through many people, you wouldn't have as strong or as lengthy a protection as the first individual did.

如果一个疫苗经过很多人的传递,再接种到你身上,你不会获得像第一个接受疫苗的人,那样强效持久的免疫效果

耶鲁公开课 - 生物医学工程探索课程节选

Southern supporters were afraid that if a statehood bill for California was passed first, then northerners would refuse to pass the other parts of the compromise.

VOA: special.2009.04.02

One--the first wave of REIT growth occurred right after Congress passed the 1960 bill.

EITs增长的第一波高潮,发生在国会1960年法案通过之后

耶鲁公开课 - 金融市场课程节选

Lincoln noted that seventy-two years had passed since the first president was inaugurated.

VOA: special.2009.07.30

The first troop train from the North passed through Baltimore,Maryland, without incident.

VOA: special.2009.08.20

It's the first-ever decision engine. From Microsoft." A Web traffic report last Friday from StatCounter said Bing twice passed Yahoo in usage in the United States in its first few weeks.

VOA: special.2009.07.17

And last June,says Sittenfeld, the House passed the American Clean Energy and Security Act, the first bill out of either chamber of Congress to directly take on the challenge of global warming.

VOA: standard.2010.02.25

In the first 51 days of this president, the administration has passed a series of really dramatic moves: the biggest financial rescue package that we have seen in decades, the largest stimulus in the history of the country, the biggest home foreclosure prevention and mortgage assistance program since the Depression."

VOA: standard.2009.03.15