1. A vector has direction as well as magnitude. 
   矢量有方向和大小。
2. A variable that has magnitude and direction. 
   一种具有大小和方向的量。
3. A quantity, such as velocity, completely specified by a magnitude and a direction. 
   向量完全由大小和方向确定的量，如速度等
4. A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion. 
   速度一种向量，其量值为物体的速率，其方向为物体运动的方向
5. A vector quantity that tends to produce an acceleration of a body in the direction of its application. 
   力一个矢量，它可使受力物体沿力的方向产生加速度

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• 1. direction vector
  空间直线的一般方程 general equation of a line in space...方向向量 direction vector...直线的点向式方程 pointdirection form equations of a line
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• 2. directionvector
  directionvariable方向变量...directionvector方向向量...directional指向 方向的 定向的
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• 3. direction
  equation of a line in space...方向向量 direction...vector
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