This prepares the loop to process the next block with an initial vector equal to the result of the first block.
于是循环可以用与第一块的结果相等的初始矢量处理下一块。
Well, , see, that is a vector field that is equal to the vector from the origin to the point where I am, so it is pointing radially away from the origin.
也就是,这个向量场等价于,从原点指向给定位置的向量,所以它是以原点为心向外辐射的。
So, one of them says the line integral for the work done by a vector field along a closed curve counterclockwise is equal to the double integral of a curl of a field over the enclosed region.
其中一种说明了,在向量场上,沿逆时针方向,向量做的功等于,平面区域上旋度F的二重积分。
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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