Okay, so the rule for adding the two vectors is, you draw the first one and at the end of that first one, you begin the second one.

矢量的加法法则就是,先画出第一个矢量,然后在它的终点,再画第二个矢量

耶鲁公开课 - 基础物理课程节选

This is a point we'll come back to, particularly when we're talking about the two most important states, two of the great powers of the period that did not have absolute rule.

这一点我们后面会详细讲,特别是当我们谈到最重要的两个,没有建立绝对统治的强国的时候

耶鲁公开课 - 欧洲文明课程节选

If you want to add two vectors, you can add the arrows by the rule I gave you or just add the components of x of the two guys to get the component of the sum and likewise for the y.

如果要把两个矢量相加,你可以用我教给你们的箭头相接的方法,或者就将二者的 x 分量相加,得到和矢量的 x 分量,y 方向也是这样

耶鲁公开课 - 基础物理课程节选