It's always upward sloping, but it may, after awhile, you get close to satiation where you've got enough.

斜率永远是正的,但是也有可能,你拿的钱够多,效用将不再上升

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Electron affinity, however, can be either negative or it can be positive.

但是，电子亲和能既可以是负的,也可以是正的。

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So if delta v is negative, in this case delta v is negative, OK, delta v is negative, pressure is a positive number, negative times negative is positive, work is greater than zero.

也就是当活塞,压缩气体的时候，做的功是正的，按照这一规定,我们需要在这里，加上一个负号，这是习惯规定。

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It could be normal, everything, that would be a Gaussian, where if you recall there was a mean, and a standard deviation, and most values were going to be close to the mean.

可能是正态分布，也就是高斯分布，只要有平均值和标准偏差值，你就可以进行调用，大部分的值都是集中在平均值附近的。

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This is called the normal distribution or the Gaussian distribution-- it's a continuous distribution.

这就是正态分布,也叫做高斯分布,这是一个连续分布

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If there were perfect correlation, then it would be a correlation of one.

如果是完全正相关的，也就是相关系数等于一。

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This is not just a U.S. Phenomenon; many countries around the world are experiencing home price booms and the beginnings of what might be a home price bust.

这个现象并非美国独有,世界上其他国家,也正经历房价暴涨,甚至是崩溃

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If when x is low, y also tends to be low, then this will be negative number and so will this, so their product is positive.

如果x取值小,同时y值也小,这将是一个负值,这个也是负值,负负得正,结果是正值

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So what we'll end up with is boron plus, 1 s 2 2 s 2 1 s 2, 2 s 2, E and what we say is the delta energy or the change in energy as the same thing as saying the energy of the products minus the energy of our reactant here, that's how much energy we have to put into the system to eject an electron.

所以结果应该是正一价的硼，电子排布为，我们说，Δ,也就是，E，的变化量,等于生成物的能量,减去反应物的能量，这就是我们从这个系统中,打出一个电子所需要的能量。

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