ground zero

ground-zero的词性：
n.（名词）

1. The target of a projectile, such as a missile or bomb.
爆破目标：投弹中的目标，如导弹或炸弹

2. The site directly below, directly above, or at the point of detonation of a nuclear weapon.
地面零点，爆心投影点：原子弹爆炸的正上方、正下方或爆炸点