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Because it has been said that each American soilder cost us one million dollars a year Ambassodor is so much cheaper.
有人说一个美国士兵每年要花费一百万美元,相比之下，大使是如此廉价。
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So we'll figure out how much does it cost,
我们会对产品评估它的广告成本，
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If I buy this amount of two-period bonds, how much does it cost me?
如果我买这么多两年期债券,我要花多少钱呢
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How much does it cost both to create the technology and to use it?
创造新技术和使用它,分别需要花多少钱？
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Now we're doing the same for IT, using standards, taking things that are in what's this big bucket known as services and really encapsulating them in the form of services and products, but in a much more cost-effective way, using standards.
现在对于整个信息技术行业我们也采取这种方法，使用标准,通过服务,注入产品和服务，通过标准，提高成本效率。
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How much does tuition cost in general?
总体上来讲，学费是多少？
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How much profits will I make if I price at marginal cost as well?
如果我定价在边际成本我能获得多少利润
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But it doesn't actually cost as much energy as you might think, because in this s orbital here we have a paired electron situation where we're moving up to a p orbital where the electron is no longer paired, so it won't feel quite as much electron repulsion, but nonetheless, this is going to cost us energy.
但它消耗的并没有,你们想象的那么多,因为s轨道里我们电子是配对的,当我们把，电子移到p轨道,电子不再配对，所以它不会感受到那么多的电子排斥，但尽管如此，这个过程还是要消耗能量的。
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.. In 1799, it would cost so much to mail a letter-- I don't know exactly, something like $10 or $20 to mail a letter at today's rate-- and it would take a long time get there.
在1799年，寄封信需要花费-,我也不清楚具体的数字,大概相当于现在的10到20块钱-,而且还要花很久才能送达。
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Now, there's the other side of the stock going up and we have to think about how much that can cost us and whether our coupons are enough and whether the difference between the $.60 that we paid is apt to cover that.
现在，如果相反，股票价格上升,那么我们必须考虑这会花费我们多少,以及我们的票息,和我们付出的0。60美元的价格和,是否能够恰好冲抵它。
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So, the optimal thing to do if you live in a world like this n is to get n as large possible and you can reduce the standard deviation of the portfolio very much and there's no cost in terms of expected return.
如果现实中也这样简单的话,那么你就尽量增大,这样就能让投资组合的标准差,就会大大降低,从预期收益率的角度来看,这样做的成本是零。
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