In these the needles are arranged parallel to each other in a flat plane.

在横机上，针在一个平面上平行排列。

youdao

Well, we enter when the ray hits the flat face, when we hit the plane.

当射线击中这个平面，就进入了区域。

youdao

Well, we enter when the ray hits the flat face, when we hit the plane.

当射线击中这个平面，就进入了区域。

youdao