星星(点光源)的亮度只是望远镜孔径的函数-孔径越大，图像越亮。

The brightness of stars (point sources) is only a function of telescope aperture-the larger the aperture, the brighter the images.

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还有另外的一种方法画出二元函数的图像。

So, there is another way to plot the functions of two variables.

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这个式子的值对应于三维空间中,函数图像下方,所有小柱体的体积之和。

So, what that corresponds to in the three-dimensional picture is just I sum the volumes of all of these little columns that sit under the graph.

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It shows the standard deviation of the return on the portfolio as a function of the expected return on the portfolio.

它是投资组合的收益标准差,关于预期收益率的函数图像。

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So what I'm going to do is I'm going to go back to my picture and draw these functions.

下面我们一起来,作出这些函数的图像

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And first we discussed the fact that well, in terms of a classical analogy, we don't really have one for wave function, we can't really think of a way to picture wave function thinking in classical terms.

首先我们说了，波函数没有一个，经典的类比，我们不能想象一个,经典的波函数的图像。

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