The"non dimensional"engine performance parameter of turbo propsis a function of three variables.

涡轮螺桨发动机的无因次性能参数是三个变量的函数。

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Except, of course, we haven't see the graph of a function of three variables because that would live in 4-dimensional space.

当然我们还不能看到，三元函数的图像，因为它处在一个四维空间里。

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So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.

为了令你们习惯于这个想法，我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。

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Sales are a function of three variables: store traffic volume, conversion rate (i.e. percentage of visitors who purchase), and average ticket.

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