From then on it must coast in a trajectory, or flight path, to its target.

从那时起，它就得沿着弹道，即沿着飞行航线滑向其目标。

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External Ballistics deals with projectile flight. The trajectory, or path, of a projectile is subject to the forces of gravity (see gravitation), drag, and lift.

外弹道学是研究射弹的飞行，弹道是射弹在重力、拖曳力和升力作用下的飞行路线。

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