n.（病原体的）媒介过程
Vector is a useless survival, or offshoot from quaternions.
向量是无用的幸存物或四元数的无价值的支流.
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.
An axial vector may itself enter into a vector product.
轴矢量自身可参与矢积.
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