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

As early as 1826 an important pro-slavery writer named Edward Brown argued that "Slavery," he said, quote: "Had ever been the stepping ladder by which nations have passed from barbarism to civilization."

早在1826年,一位重要的亲奴主义作家,爱德华·布朗说过,"奴隶制,曾是帮助那些国家从野蛮时期,发展到文明社会的阶梯"

耶鲁公开课 - 美国内战与重建课程节选

Have I ever passed by while a movie was going on there?

电影正在那儿拍摄的时候，我是否曾正好经过？

电影里的中央车站 - SpeakingMax英语口语达人

Some experts think banks have seen the worst of their losses and that the worst of the financial crisis may already have passed.

VOA: special.2009.04.17

So purification offerings are brought ; after the genital discharge has healed and passed; after the appropriate ablutions have been observed and the person is essentially pure.

因此净化祭通常是在,生殖器排放之后进行的;,在适当的沐浴之后,人已经变得完全纯洁了可以。

耶鲁公开课 - 旧约导论课程节选

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

VOA: special.2009.09.22

What these people have to work with are the tools that have been passed down to them, The poverty of the people Frost writes about is important.

这些人需要用一代代传下来,的工具或者自己制造的工具，弗罗斯特所写的这些人的贫穷非常重要。

耶鲁公开课 - 现代诗歌课程节选

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

All right. We have them here and they'll be passed around.

我这里还有，现在传下去了。

耶鲁公开课 - 文学理论导论课程节选

The American Lung Association says half of the fifty states have passed smoke-free laws.

VOA: special.2009.05.27

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

On May fifteenth, just seventeen days after leaving New York, Captain Creesy wrote this in the Flying Cloud's log: "We have passed the Equator in two days less time than ever before.

VOA: special.2009.12.23

So presumably, these two cells have exactly the same DNA content, but something's been passed onto this one that wasn't there.

按照预计,这两个子细胞应该有完全相同的DNA,但某种成分传给了一个细胞而不是另一个

耶鲁公开课 - 生物医学工程探索课程节选

(Speaking) Travelers facing even greater scrutiny come from, or have passed through, the 14 nations that the U.S.

VOA: standard.2010.01.05

Variations of it have passed recently in Vermont,California, and Oregon.

VOA: standard.2010.03.23

Weeks have passed support, since President Obama's top commander in Afghanistan formally urged the White House to order a swift surge of U.S.troops to battle militant extremists in the violence-plagued nation.

VOA: standard.2009.11.23

There have been laws that have been passed, and many police officers and other authorities are being trained about this.

VOA: special.2010.06.24

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

VOA: special.2009.06.23

More than forty percent of Americans have an ancestor who passed through Ellis Island.

VOA: special.2009.06.29

The Senate and House of Representatives have each passed their own health care legislation.

VOA: special.2010.01.23

Fifty years have now passed without any changes to the American flag.

VOA: special.2010.04.02

That person must have been surprised when the substance passed the test.

VOA: special.2010.02.09

"You can imagine the impact that this would have on whole communities throughout the country and why there would be such passions that have been passed on from generation to generation even at the remove of one hundred fifty years."

VOA: special.2011.04.09

"And the only think worse than the policy itself has been the process that the Democrats have followed to get this passed,".

VOA: standard.2009.12.27

Since the federal law was passed a decade ago, many state and local communities have followed suit.

VOA: standard.2010.02.18

That information should have been passed on to U.S.databases, but it is unclear if that actually happened.

VOA: standard.2009.12.28

The measure then would have to be reconciled with the House-passed legislation before a final bill is sent to President Obama for his signature.

VOA: standard.2009.05.20

"We did our job. A significant phase has been passed through with as little harm done as conceivably could have been done under the circumstances.

VOA: standard.2010.04.21

More than 2 million jobs have been lost since Congress passed Mr.Obama's in February.

VOA: standard.2009.07.14

"We have lost two-million jobs since the stimulus bill was passed,".

VOA: standard.2009.08.02