“哑弹”用英语怎么说

至关重要的炮弹总是哑弹.The crucial round is a dud.迫击炮弹幕只有一发能命中目标, 这一发通常是哑弹.Your mortar barrage round on the intended target. That round will be a dud.如果坏盒中的哑弹是四枚,那麽对应的机率又会怎麽变化 呢 ?How would the probability change if the bad pile con...