Define all variables at the top of the function.
在函数的首部定义所有的变量。
OK, so now, let's say that we had, actually, a function of two variables.
可能是这样的，现在我们可以说，有一个含有两个变量的函数。
So, when we think of a graph, really, it is a function of two variables.
因此当我们在想像一个图像时，其实那只是一个二元函数的图像。
Well, let's say how to visualize a function of two variables.
如何想象一个有两个变量的函数。
That was our first example of a function of two variables possibly.
这是二元函数中的第一个例子。
Oh, a function of two variables.
这的确是一个二元函数。
The demand for health services is a function of many variables.
卫生服务需求量是一系列变量的函数。
Limit of function of two variables is more complex than that of one variable.
二元函数的极限远比一元函数的极限复杂，但它们之间又有密切的联系。
The teaching of function of several variables is a difficult point in higher mathematics teaching.
求最值问题是中等数学永恒的话题，其中，多元函数求最值是难点。
The teaching of function of several variables is a difficult point in higher mathematics teaching.
求最值问题是中等数学永恒的话题，其中，多元函数求最值是难点。
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