I draw a graph here of the amount by which I pull the spring versus the force it exerts.

我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小

耶鲁公开课 - 基础物理课程节选

We learned that a vector is a quantity that has a magnitude and a direction.

我们已经知道矢量是一个,既有大小又有方向的量

耶鲁公开课 - 基础物理课程节选