It's the same vector So, a lot of vectors we'll draw starting at the origin but we don't have to.
它们是同一个向量，通常我们都选原点作为向量的起点，但是我们不一定要这么做。
2
That would be given by a vector field that points toward the origin and whose magnitude is inversely proportional to the square of a distance from the origin.
力场由一个指向原点的向量场给出，并且此向量场的大小，与其到原点的距离的平方成反比。
3
So, the position of this point, p, is going to be the same as OP knowing the vector OP from the origin to this moving point.