This is how you get the rules for adding a vector to another vector, then taking a vector and multiplying it by some constant.
以上这些就是矢量加法的法则,以及数乘矢量的法则
Okay, so that tells you how to add two vectors and get a sum.
这就是矢量的加法法则
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
This is the rule for adding vectors.
这就是矢量的加法法则
It is clear that that vector is the sum of that vector and that vector, by the rules of vector addition, because that plus that is equal to the A.
这个矢量是这个两个矢量之和,根据矢量加法的法则,因为这两个矢量相加就等于 A
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