direction of motion

• 运动方向

direction of motion的用法和样例：

例句

1. The orientation of a spacecraft relative to its direction of motion.
   飞行姿态宇宙飞船相对于其飞行方向所处的位置
2. 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