Since 5 is less than 35 (the sum of injury and defensive costs if the future enemy attack is not prevented), the preventive war is cost-justified.

• 既然5分比35分要少(如果将来敌人的袭击不是预防性的话,这一成本将等于受伤和自卫成本的总和),那么从成本计算来看,预防性战争是合理的。