当这些弹丸飞离炮管和枪管时刻，每一枚都会有了自己的弹道（抛物线）和不同的速率。
When these balls leave the barrel of a cannon or rifle they have an associated trajectory, velocity and so on and so forth.
当这些弹丸飞离炮管和枪管时刻，每一枚都会有了自己的弹道（抛物线）和不同的速率。
When these balls leave the barrel of a cannon or rifle they have an associated trajectory, velocity and so on and so forth.
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