target practice projectile 射击练习弹

optimum projectile-target combination 最佳弹靶组合

target-practice projectile 训练弹

projectile target 弹目

projectile-target impact 弹靶碰撞

projectile target crossing 弹目交会

projectile target deviation 弹目偏差

projectile impacts on target 弹丸撞靶

Deviation between projectile and target 弹目偏差