And, the direction is essentially that of a vector.
方向基本和这里的单位切向量一致。
What is the direction of the vector?
矢量c的方向是什么？
Zero vector can have a lot of direction, but only one length.
零向量可以有很多方向，却只有一个长度。
The direction of the electric field vector is indicated in each picture.
每张照片上都标出了电场矢量的方向。
The direction of the electric field vector is indicated in each picture.
每张照片上都标出了电场矢量的方向。
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