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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
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We use the whiteboards alongside one of the walls, where you just write down your name if you have a question.
用其中一面墙壁旁边的白色书写板，如果有问题，你只要在那里写下你的名字。
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I think with all the media we have available today is definitely good to kind of use that as a tool if you can.
我觉得，如果你会用的话，我们现今可用的媒体绝对是个不错的工具。
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Professor Hess says a major value of sustainable agriculture is making good use of what you have.
VOA: special.2009.04.14
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Second skill we want you to have at the end of this course is the ability to use a vocabulary of computational tools in order to be able to understand programs written by others.
我们想让你们在课程结束时,掌握的第二个技能,是有能力使用计算工具的语言,用来理解,别人编写的程序。
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But you have to use a safe method or you could do a lot of damage.
VOA: special.2010.03.31
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And they wanted to use a soluble salt of citric acid, so they could have used sodium, they could have used potassium.
而且他们想用一种柠檬酸的可溶性盐，他们本可以用钠，也可以用钾。
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Have you ever agreed to the "terms of use" for a service without reading it all?
VOA: special.2010.04.30
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The way we use technology to overcome that is we have a lot of simulations and visualizations set up, built around in the virtual spaces.
我们用技术来解决这个问题的方法,是我们用很多模拟实验,以及直观化实验，放在模拟空间里。
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"One of the challenges we have is to make the Web a lot easier to use even on the simplest and least expensive mobile phones."
VOA: special.2010.11.08
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So again, if you do a calculation where you're close enough to the ideal gas and you need to design your, if you have an engineer designing something that's got a bunch of gases around, this is a useful thing to use.
要研究近似理想气体的表现时,这个方程非常有用,下面再来看一个，对我们来说最有意思的,实际气体状态方程：,范德瓦尔斯方程。
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The first involves sheep. Researchers have found that hair sheep are a good source of blood for use in tests to diagnose infectious diseases in people.
VOA: special.2009.08.03
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We're going to talk a lot about how one can use the technology that we have now to treat these kinds of diseases like cancer and heart disease.
我们会讲到,如何利用现有的技术,来治疗像心脏病和癌症这样的疾病
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Belladonna and other poison plants have a long history of medical use.
VOA: special.2009.08.25
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So, we end up here within an octave-- we end up with twelve equal pitches, but we still use this term a 'seven-note scale' because we have seven notes within the scale of the major scale and seven notes within the scale of the minor scale.
因此,我们在一个八度内,最终得到等量划分的十二个音高,但是我们始终称之为"七音音阶",因为在大调音阶上有七个音符,在小调音阶上也有七个
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"The military commissions have been reformed by the Congress and the Obama administration in a way that prohibits absolutely the use of any evidence obtained through torture or cruelty."
VOA: special.2010.11.20
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So, university professors have teaching evaluations and you could use this as a rough and ready approximation of what students think of them.
大学教授要接受教学评估,你可以借此大致地概括出,学生对教授有什么看法。
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"So if you have hoarseness with tobacco or alcohol use, that would be a significant risk factor for cancer or other problems of the throat that could be serious.
VOA: special.2009.09.02
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But for now let's simply say that we have a diffraction which we know occurs only by wave-like behavior and it involves the use of x-rays. Why x-rays?
但现在让我们来简单假设一下,我们知道,只波才发生衍射,而且衍射涉及了X光的使用，为什么是X光？
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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
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But thankfully I also found in my trolling around this morning,something that is perhaps technically motivating and at least remains for those of you which is many of you who actually use Gmail, you might have seen a little advert in the top right hand corner recently saying new beta version of a little something called Gmail Priority Inbox.
幸运的是我今天早上在网上闲逛的时候,发现了一些东西,一些对还在使用Gmail的人来说,可能在技术上有吸引力的东西，你可能已经看到,其右上方有个广告说的是,新版本Gmail优先收件箱发布了。
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It's a country more like the mountainous parts of Afghanistan, where you have to undertake special operations, more use of the air (power) and, also,political handling.
VOA: standard.2009.06.18
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Also you will often use a contraction. Instead of saying "you have" you'll say "you've."
你也会经常用到缩写的形式，一般我们会说“you've”而不是“you have”。
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Bereket told reporters, pro-government Somali militias have permission to use Ethiopia as a base of operations in attacking al-Shabab rebels, who control large sections of southern Somalia.
VOA: standard.2009.08.20
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But if you're going to have a big old fort, and you're going to have lots of cannon that you hope to use against your craven, reptile enemies that would want to get in your way, you've got to have people to try out the cannon.
如果你想攻占一个大型的旧式堡垒,你必须要有很多大炮,来对付那些缩在城堡中的敌人,还需要很多士兵来操纵这些大炮
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"we don't have money to buy insecticide, the little money we have, we use to take care of the kids, we don't have a lot of money."
VOA: standard.2010.03.30
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OK. The other piece I want to say about variable names is, once I have that choice of variable name, I can use it, but in fact there are a few things that I can't use in terms of variable names.
关于变量名字我还想说的,另外一点就是，一旦我对变量的名称可以选择，我可以用自己的方式命名，但是,有一些词汇是,不能用来命名变量的。
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you have to assume they are in," He says the more advanced a country is in its use of computers and the Internet, the more vulnerable it may be.
VOA: standard.2009.08.11
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If I look at different points in my container during that path, I'm going to have to use a different value of pressure or different value of temperature That's not an equilibrium state, and that process turns out then to be an irreversible process.
如果我要研究在路径中容器里的,不同的点，我就得在容器里不同的点上使用,不同的压强值,或不同的温度值,实际上这不是个平衡态，这个过程是,不可逆过程。
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So you build it with a material like silver and gold, and then you encounter the problems of society that your bridge might get stolen because somebody thinks they have a better use for silver and gold than your bridge.
但如果你用金或银这样的材料,你又会面对新的问题,你的桥会被偷走,因为有人认为金和银有比造桥更好的用途
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