So, if we want to set it up instead dx dy, then it means we are going to actually look at the converse question which is, for a given value of y, what is the range of values of x?
如果要用dxdy来替换，就是说,转化为与之相反的问题来看，给定y的一个值，那么x的取值范围是什么呢？
z It means that for given values of y and z z we will get a term that does not depend on x. It still depends on y and z.
它意味着，对于任意给定的y和,我们会得到一个不依赖于x的项，它仍然依赖于y和。
The When attribute value of Y means that the command should be executed for each item that evaluates to true.
Y的when属性值表示应当为计算结果为真的每个项目执行该命令。
So, that means that the value of F depends actually on y two different parameters, say,if the variables are x and y, or they can have any names you want.
这意味者F的值取决于,两个不同的参数x和，或者其他名字。
Remember, partial f, partial x was obtained by y That means I am slicing the graph of f by a plane that is parallel to the x, z plane.
要记得，在这里的fx中,是作为常量保持不变的。，looking，at，the，situation，where，y，is，held，constant。,这是我用一个平行于xz坐标系的平面,横截了f，所得到的图形。
Y., chairman of the House Ways and Means committee, we urged that the House ethics committee be allowed to investigate before anyone drew final conclusions.
时，曾敦促众议院道德规范委员会容许在详细调查后才下结论。
Y., chairman of the House Ways and Means committee, we urged that the House ethics committee be allowed to investigate before anyone drew final conclusions.
时，曾敦促众议院道德规范委员会容许在详细调查后才下结论。
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