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It would be so easy if you built a cohesive system that carries the entire transaction to create a receipt that is useful.
如果你建立一个,能覆盖整个交易过程,能产生有效的收据的系统,一切都会变得更容易。
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If I were" is useful for talking about things that you hope for, things that you imagine to happen,
If I were”在谈论你渴望的事情和想象会发生的事情时非常有用。
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What does come out, which is very useful is, if you do run the reaction, here's how much heat comes out.
能得到的结果是，如果我们进行这个化学反应，有多少热量放出，当然这也是很重要的。
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Sometimes a blunt cut is useful if you want to sort of grow a sticky end of your choice on it.
这时候钝切口很有用,尤其在你想获得选定的粘性末端的时候
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But in terms of SI units, which become much more useful if you're actually trying to use intensity in a problem and cancel out your units, we're just talking about joules per second is what intensity is.
但是用国际单位制，这个变得越来越有用了,如果你实际上在使用强度,来解决问题和约化单位，我们仅仅讨论每秒钟的焦耳,这就是强度。
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So it has to have that. Typically it's nice if it can have useful intermediate results.
否则为什么还要那么麻烦去运行它呢？,因此实验必须有这个可能。
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If you focus on some of the minutia of a site like this, you know, it's useful to be able to jump to a particular date whether in the future or in the past.
如果你关注像这样一个网站的一些细节，你会发现，若能跳转到,不论过去还是将来的一个特定日期，那将是很有用的。
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If you want to remember your dream by the way keep your dreams--keep a dream diary, very useful, but everybody dreams three to four times a night.
如果你想记得自己梦见什么,那就写一本梦境日记，这是非常有用的，每个人平均一晚作三四次梦。
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I actually want to change that around, if I might, and play with that, because that's a really useful image for us: "takes the mask off literature and reminds us how we come to be sympathetic or Richard Wright how we come to think something." Think back to Richard Wright, who wants words to disappear, to be completely transparent and to leave you just with your response.
实际上，我想要改变一点，可能的话，玩弄一下，因为那对我们是很有用的画面：,把文学的面具卸下,我们是如何同情,或思考事物的，回想一下，他希望文字消失，而变成透明的，只剩下你们的回应。
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So if you learn how to look at films and if you are a real film buff, even bad movies will be useful, because they will give you things to develop your sensitivity toward the nature of film itself.
所以如果你们可以学会如何看电影,如果你们真的对电影了如指掌，即使是不好的电影也会很有用，因为,它会培养你对,电影本质的敏感程度。
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Because at the end of the day, if game theory is going to be useful for you in your later lives, whether it's in dating or in running a company or whatever it happens to be, you need to able to go from the story to the model.
因为到最后,如果你们在以后想要运用博弈论,不论是用在约会上还是在运作一家公司上,或者其他的什么情况,你需要从具体情况中提炼模型
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And that's probably useful if you're actually trying to format things in a nice way.
这个可能有用，当你想把它的格式,变得美观一点的时候。
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If I'm working under conditions of constant temperature and volume, that's very useful.
如果在恒定的温度和体积下,进行一个过程，这是非常方便的。
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It's not enough to understand the biology of how to create a vaccine, if you can't make enough of the vaccine or deliver it to people in ways that it's useful.
仅仅知道疫苗制造的,生物学原理是不够的,还得能生产出足够的疫苗,并在公众中广泛使用
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Now, if we go back to our Carnot cycle which is a set of reversible paths, it's useful to compare this to what happens in an irreversible case.
如果回到卡诺循环,它是由一系列可逆过程组成，我们将它,和不可逆过程的情况相比较。
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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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If you actually read it, that's a useful indicator.
如果你阅读了这个邮件，这也是个有用的暗示。
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Here's an example where we'd like to make insulin, or having the insulin gene would be useful, but if we could take the insulin gene and make many copies of the insulin protein that would be a very useful thing.
例子就是我们人工制造胰岛素,胰岛素基因就很有用,但如果我们可以用胰岛素基因,复制很多胰岛素蛋白,这将会是非常有裨益的一件事
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And this is useful because if you're actually writing a program that's interactive or that you want to change overtime much like you would a game, hopefully, the game is not going to have the bad guys, for instance, always standing in the same place or the rocks or whatever it is falling from the sky in the same place 'cause it would very quickly become a very tedious game.
这是很有用的，因为如果,写一个交互的程序或者,希望每次游戏都不一样，我们希望，游戏中的坏人物，别老是站在同一个地方或者同一块石头上,或者从天空中同样的位置落下,因为这立刻会使游戏变得乏味。
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Well, it would be useful because if I could take cells from the skin, find stem cells in the skin and then de-differentiate them so that they were now capable of becoming liver, or brain, or things that they're not going to become in their normal site, then that could be a very powerful tool for medicine.
这是因为,如果我能取一些皮肤细胞,找一些皮肤干细胞,并将它们去分化,那它们就能分化成肝脏,大脑或其他一些,它们原本分化不出来的细胞,这可以成为一个医学利器
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Because even though it's a little confusing or a little sort of contradictory, the argument count includes the name of the program itself, -- which can actually be int useful because if someone -- if a producer changes the name of a program by renaming a file, you, the program still have access to your own name by this mechanism.
因为即使它有点迷惑的,或有点冲突的，参数计数包括程序的名字，那个可以是int型的，因为如果有谁-,如果程序员通过重命名改变了一个程序的名字，你仍然可以用这个机制,使用你自己的名字。
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