That would come by saying, "I'm taking i times Ax + j times Ay + i times Bx + j times By, " and I'm trying to add all these guys.

那就这样做,"i ? Ax + j ? Ay + i ? Bx + j ? By",然后把它们都加起来

耶鲁公开课 - 基础物理课程节选

Now, when you work with components, Ax and Ay, if I didn't mention it, they are the components of the vector, you can do all your bookkeeping in terms of Ax and Ay.

当你们在计算分量 Ax 和 Ay 的时候,即使我没有说明,你们也要记得它们是矢量的分量,你们可以都用 Ax 和 Ay 的形式来表示

耶鲁公开课 - 基础物理课程节选