“投射物”常见的英文表达是 projectile。它既可以指被发射出去的物体（如子弹、炮弹等投射出的物体），也可用于描述物理学中相关概念。例如：
A projectile is any object that is projected by some force and continues in motion by its own inertia.（投射物是指被某种力投射出去，并依靠自身惯性继续运动的物体。 ）
The soldiers were trained to dodge incoming projectiles.（士兵们接受过躲避来袭投射物的训练。 ）