对于给定的x，对应一个切面，就可以得到一个y的取值范围，从图片上看，是从切面的最左边到最右边。

For a given value of x, so that's a given slice, I have a range of values for y, that is, from this picture at the left most point on that slice to the rightmost point on that slice.

youdao

从美国宇航员的照片上看，他们的月球车停靠在登陆舱很远的地方，图片上没有车辙痕迹，就好像那辆登陆车是从太空舱飞过去的。

S. astronauts, their vehicle parked very far away from the lunar lander, there are no track marks on the picture, just like the Rover had flown over from the capsule.

youdao