An animal you have never seen before. You only have one shot to fire. You don't want to end up hitting its tail unless you know the tail is important.
好比你在叢林中遭到襲擊，攻擊你的是一種從來沒見過的動物，而你身上的彈藥有限，甚至只有一發子彈，最好一次命中要害。