She says the danger is real. "It's the number one threat to American security today - to American and global security,frankly.

VOA: standard.2010.04.06

Your birthday and social security number is what you look up.

你的生日和社保号码才是你应该查的

耶鲁公开课 - 基础物理课程节选

It's like you have a social security number or other ID number, which positively--there might be another person with the same name as you, God forbid, but you at least have your own number, which is guaranteed to be unique to you.

就好比社保号,或者其他身份号码,很有可能,有另外一个人,和你重名,希望这不要发生,但你至少有唯一的识别号,用于区分自己和他人

耶鲁公开课 - 金融市场课程节选

That approach requires a large number of troops to provide security and help the local government assert its authority and deliver services.

VOA: standard.2009.10.01

This number, CUSIP number, is a number that identifies any security.

USIP代码是所有美国股票及注册债券的编号由美国统一证券辨认委员会管理,用于区别每一项证券

耶鲁公开课 - 金融市场课程节选

Security experts agree that given the number of targets and the infinite ways they can be exploited, security can never be 100 percent.

VOA: standard.2010.01.19

But he says a significant number of foreign troops will be needed to help establish and then maintain security in Afghanistan, possibly for decades.

VOA: standard.2009.10.16

Meanwhile,security forces reportedly arrested a number of women protesters at a Tehran park, who meet regularly to protest their children's detention in government prisons.

VOA: standard.2009.12.07

President Obama and his national security team are considering a request from his new commander in Afghanistan, General Stanley McChrystal, for a substantial number of additional troops.

VOA: standard.2009.10.13

Ambassador Rice said she expects a large number, if not all, of the 15 Security Council members to be represented at the head of state or government level.

VOA: standard.2009.09.02

As part of the new strategy, Napolitano says the United States will double the number of border security teams, and will quadruple the number of border liaison officers who work with Mexican officials.

VOA: standard.2009.03.24

"It needs to be fully vetted, and when it is then we'll determine a number that makes sense for the security and stability of Afghanistan, that the Afghan government and its people can sustain with the assistance of coalition partners,".

VOA: standard.2009.03.31