So,yes,there is a threat particularly of the use of radioactive material, although we have no specific evidence indicating any capability at this time."

VOA: standard.2009.05.01

And the reason is, and this will come up on the problems and a lot of students end up using this equation, which is why I want to head it off and mention it ahead of time, we can't use an equation because this equation is very specific for light.

原因是，很多同学在解题时,都会用这个方程，所以我要,事先提醒你们一下,我们不能用这个方程，因为它只对光是用。

麻省理工公开课 - 化学原理课程节选

That's why every-- development of every specific vaccine turns out to be different because they don't all follow exactly this kind of time course.

这就是为什么,每一种疫苗的发展都是不同的,因为疫苗诱导产生应答所需时间各不相同

耶鲁公开课 - 生物医学工程探索课程节选

"Additional forces will begin to deploy shortly,". "And by this time next year, new security gains will be illuminated by specific indicators and it will be clear to us that the insurgency has lost the momentum.

VOA: standard.2009.12.09

c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?

我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？

麻省理工公开课 - 化学原理课程节选

"This is a time where business community looks for specific concrete moves by the government so that we are able to build confidence and bring confidence back to the system and at the same time we'll be able to help promote more trade and investment,".

VOA: standard.2009.11.11