arc of motion

例句：

1. 1. Thearc of motion is the curved paththat a projectile follows as it travels through the air.
   运动轨迹是弹道在空气中飞行时所遵循的弯曲路径。
2. 2. The arc of motion isoften used to describe the path of anobject moving in a circle or ellipse.
   运动轨迹常用来描述物体在圆或椭圆中移动的路径。
3. 3. Thearc of motion can be used tocalculate the speed and distance traveled by anobject during its flight.
   运动轨迹可以用来计算物体飞行过程中的速度和距离。