The usual function of my equivalent of Power point isn't quite the same today because I'm taking an interest in some of these diagrammatic matters as well and, as I say, I will be pointingto them.
以前我的粉笔相当于幻灯片的功能，但是今天不太一样，今天我们会用到一些图表，我会指着它们讲解。
2
Pointing refers to the requirement to point the satellite (or an instrument on the satellite) toward some ground object.
指向的意思是要求卫星(或卫星上的设备)朝向一些地面目标。
3
Well, , see, that is a vector field that is equal to the vector from the origin to the point where I am, so it is pointing radially away from the origin.