But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

But in England, the tradition of freedom and government bound by law was already strong enough to produce effective resistance.

但是在英国,自由传统和法制政府,使得自由得以很好的保护

耶鲁公开课 - 古希腊历史简介课程节选

But what's important is not where that most probable radius is when we're talking about the z effective it feels, what's more important is how close the electron actually can get the nucleus.

但重要的不是,最可能半径,当我们谈论它感到的有效电荷量的时候，更重要的是,电子实际上。

麻省理工公开课 - 化学原理课程节选

But his most effective way to spread his anti-violence message is through radio.

VOA: special.2010.08.26

But essentially the only reason there was any way that that was an effective approach was because people basically realize "Oh this is a good idea and we agree with that as a culture."

但是，归根结底，这种方式之所以,能够取得成功，是因为,人们意识到,“哦，这挺好的，我们的文化可以接受它“,“哦，这挺好的，我们的文化可以接受它“

普林斯顿公开课 - 人性课程节选

But it has been effective. It has helped to balance a potentially disruptive tension between the desires of a minority and the broader interests of our all-volunteer force."

VOA: special.2010.02.06

But we also need it to become effective citizens.

然而我们也需要劳动力变成高效的公民。

麻省理工公开课 - 媒体、教育、市场课程节选

But this increased attention does not mean anything without effective action.

VOA: special.2009.05.08

And so there's a lot of interest, not just in developing vaccines for diseases that we don't have vaccines for, but for delivering vaccines that are more effective.

所以我们感兴趣的领域,不仅包括针对还没有疫苗的疾病,来研发疫苗,还要开发更有效的疫苗

耶鲁公开课 - 生物医学工程探索课程节选

it says, " but rather more effective regulation."

VOA: special.2009.06.19

He said Southerners are "Proud, brave, honorable by its" The South is "Proud, brave, honorable by its lights, courteous, personally generous, loyal, swift to act, often too swift, but signally effective, sometimes terrible in its actions.

他写道南方,"因自豪勇敢而可敬",南方人,"因自豪勇敢而可敬,他们彬彬有礼,对人慷慨,他们忠诚,行动迅速,常常过于迅速,但他们效率显著,有时甚至不择手段

耶鲁公开课 - 美国内战与重建课程节选

The visa for James Elder, an Australian,has been canceled effective Monday, but officials say after an appeal from the United Nations he will be allowed to stay there under September 21.

VOA: standard.2009.09.06

Now we're doing the same for IT, using standards, taking things that are in what's this big bucket known as services and really encapsulating them in the form of services and products, but in a much more cost-effective way, using standards.

现在对于整个信息技术行业我们也采取这种方法，使用标准,通过服务,注入产品和服务，通过标准，提高成本效率。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

Some fire chiefs in California say that residents should always be encouraged to evacuate, but Naomi Brown, from the Australasian Fire and Emergency Service Authorities Council, says installing effective early warning systems is the key.

VOA: standard.2009.06.24

Now, the polio vaccine that Salk produced was very effective, but it required a fairly large dose of the vaccine and it had to be injected into the arms of children.

索尔克生产的小儿麻痹症疫苗效果显著,但是,该疫苗的单支注射剂量非常大,而且必须通过小孩的手臂进行注射

耶鲁公开课 - 生物医学工程探索课程节选

"What we assure is that the technologies that do come on the market are safe and effective, but whether or not they should be used on a given case,a given patient, is a decision that is made by the individual practitioner."

VOA: standard.2010.04.07

But it's only an effective vaccine in the context where you have people who can go to the doctor's office, or to an urgent care, some kind of medical facility, three times, reliably, at a specified period of time.

但为了保证接种效果,人们必须亲自去诊疗室,或者在急诊室里,使用一些医学设施辅助接种,还需要接种三次,它只在一段时间内有效

耶鲁公开课 - 生物医学工程探索课程节选

"Since that time we've really learned that as close as they are to human species, they're not close enough for any real scientific outcomes for drug testing.I think like that" That's Elizabeth Kucinich, wife of U.S. Congressman Dennis Kucinich, she is a long-time animal welfare advocate and serves as director of public affairs, for the Physicians Committee "Over 80 different HIV-related vaccines have worked in chimpanzees but none have proven effective in human beings.

VOA: standard.2010.02.16

So, it's more effective because it's a live virus but it's a little bit more concerning because it's a live virus as well, in that you trust that it's attenuated but could it convert back to a virulent form or a form that caused a disease.

因此,口服疫苗更加有效,因为它是活性病毒,但又是因为这一点,人们也存有更多顾虑,当它处于减毒状态时你会信任它,但是它会不会转变回,强毒壮态或者致病状态呢

耶鲁公开课 - 生物医学工程探索课程节选