矢量

• Note that it does not have the same direction as the velocity vector .
  要注意它的方向与速度矢量的方向不同。
• Inertia scalars are defined in terms of quantities called inertia vectors .
  我们将用惯性矢量来定义惯性标量。
• 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 dot product of a pseudovector and a vector is called a pseudoscalar .
  一个赝矢量和一个矢量的标识称为赝标量。
• A vector quantity is an entity with a magnitude and a direction in space .
  矢量是空间中既具有大小又具有方向的量。
• Two vector quantities which are equal need not have the same physical effect .
  两个相等的矢量并不一定有相同的物理效果。
• The magnitudes of the rectangular components of a vector are easily computed .
  一个矢量的正交分量的大小是很容易计算的。
• Every vector can be resolved into covariant or into contravariant components .
  每个矢量都可以分解成协变分量或逆变分量。
• A vector quantity is one whose direction as well as its magnitude is significant .
  矢量是一个其方向和其大小同样有意义的量。
• It is interesting and enlightening to consider the derivative of a vector .
  这对研究矢量的导数来说是重要的，而且富有启发性。