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。
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