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？

youdao

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。

youdao

Just to the right, I also set up a value range for each of these colors.

就从右边开始，我为每一个颜色建立了一个色值范围。

youdao