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The father is an efficiency expert, an expert in doing things better and faster.
VOA: special.2009.05.04
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And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.
在实际中，我们定义,效率为热与功的比值。
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In principle, this value, this efficiency, can approach 1 as the low temperature approaches absolute zero.
这个值，效率，当低温热源的温度1,是据对零度时可以达到一。
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Some manufacturers are pushing cars to new levels of fuel efficiency.
VOA: special.2010.11.17
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But the things we were trying to stress were that it's an important design decision when you are coming up with a piece of code, as to what kind of efficiency your code has.
但是我们这里要强调的是,当你写代码的时候,决定你的代码的效率的很重要的事情，就是你的设计决定。
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The letters H-E-P-A represent the words High Efficiency Particulate Air.
VOA: special.2009.07.14
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Now, we concluded last week at looking at sorts and efficiency, some new notation called asymptotic notation and we'll continue that story today.
上周我们着眼于排序和效率问题，并提出一些渐近线的新符号,今天我们将继续讨论相关内容。
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The Tennessee senator also wants more exploration for offshore oil and natural gas, and more conservation and efficiency in electricity use.
VOA: standard.2009.04.25
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If the vehicle in the unfortunate circumstances of a collision, has to be able to maintain the security of the hydrogen which means more mass, which means a lot of the efficiency is being squandered What's the environmental impact of hydrogen production?
如果车辆,在碰撞中发生了不幸，要仍然能够保持氢气的安全性的话,意味着需要更多的质量，也就是说大部分效率被浪费了,制氢对环境有什么影响呢？
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Why do we need energy efficiency experts? Introducing them means hitting the energy monopolist over the head.
VOA: standard.2010.02.03
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People do that with differing levels of efficiency.
人们存储能量的效率各不相同
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He said Russia will none-the-less continue to push for domestic energy efficiency and cuts in carbon emissions.
VOA: standard.2009.12.25
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And so instead of defining efficiency the way you've got it written there, I'm going to define what's called something different for a refrigerator which is called the coefficient of performance.
现在我们不用,效率的那个定义，我给出一个,有关制冷机的,新的定义,叫做制冷系数。
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He talked with one group about creating jobs by promoting energy efficiency and so-called clean energy.
VOA: standard.2009.12.04
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So that means we can rewrite this efficiency.
这意味着我们可以重写出效率。
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"Very encouraging, I think they've made a lot of significant progress especially in command and control and the quality of their Kandaks and their efficiency."
VOA: standard.2010.05.26
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As long as it's reversible, you know what the efficiency has to be, and in principle, you could break it down into a bunch of steps that you could formulate as isothermal and adiabatic.
只要这个循环过程是可逆的，你们知道效率是多少，从理论上说，可以将总过程,分解成一系列绝热,和等温的小过程。
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U.S.President Barack Obama has used his weekly address to encourage fiscal discipline in the federal government, and outline his plans to eliminate waste and increase efficiency.
VOA: standard.2009.04.25
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Now, let's just look at our efficiency.
现在让我们看看效率。
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Energy efficiency means fewer energy profits,".
VOA: standard.2010.02.03
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Now. It's a quick sidebar, I've got to say, I'm sure talking about efficiency to folks like you probably seems really strange.
这是个快速寻找的工具，我必须说跟你们讨论效率,看起来有点奇怪。
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"At a per-passenger-mile basis, rail is about three times as efficient as travel by car, in terms of fuel efficiency, and six times as efficient as travel by air, so there are pretty substantial pollution reduction benefits both in terms of greenhouse gases and other pollutants."
VOA: standard.2010.02.15
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And I just want to write those because what I really want to get at is what's the efficiency of the whole thing?
我写出这些的原因,是我真正想得到的是,它的效率？
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I mean, you grew up in an age when computers were blazingly fast, and have tons of memory, so why in the world do you care about efficiency?
我的意思是你们是伴随着,计算机快速发展成长的，计算机都有这么大的内存,那还在乎效率干嘛呢？
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We've formulated one particular kind of engine, and seen how we can analyze what it does, come up with relations that seem of value for efficiency and other quantities.
这是一个很典型的热机，我们来分析它是怎么工作的，然后得到效率和其它一些,有用物理量之间的关系。
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So we're not going to turn you into an expert on computational efficiency.
我们并不是要把你训练成,一个计算效率专家。
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Now, efficiency is obviously an important consideration when you're designing code, although I have to admit, at least for me, I usually want to at least start initially with code that works, and then worry about how I might go back and come up with more efficient implementation.
现在，当你设计程序的时候效率,是不得不考虑的问题，虽然我必须承认，至少对我来说,我是先担心程序能不能运行,再去把它的效率优化的,我喜欢可靠点的东西。
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That's our expression for the efficiency.
这就是效率的表达式。
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We can figure out the efficiency.
可以计算出效率。
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So what this says is the efficiency of any reversible engine T1 has to be one minus T2 over T1.
这就是说,任何可逆热机的效率都是,负T2除以。
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