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？
Is this a very small value for generalization to a testing set? What range should I keep it in?
这是概括一个测试集的一个很小的值？我应该保持在什么范围？
The function returns a specific value (or range of values) to indicate an error, and the global variable errno is set to indicate the cause of the problem.
函数返回特定值(或值范围)以指明错误，且设置全局变量errno以指明问题的起因。
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