So, we said vertically simple egion looks like x goes between a and b, and y goes between two values that are given by functions of x.

我们说过简单的竖直区域是x在a与b之间，而y在x的函数值两个值之间。

youdao

So, we said vertically simple egion looks like x goes between a and b, and y goes between two values that are given by functions of x.

我们说过简单的竖直区域是x在a与b之间，而y在x的函数值两个值之间。

youdao