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。
2
New cable substantial drag chain appearance more beautiful, external ornament has yellow buckle.
新型电缆护线拖链外观更加漂亮、外部点缀有黄扣。
3
Drag-and-drop the required items from the external library panel to the current project's library.