What they actually saw was ball lightning, which is when a bright light, usually spherical or pear-shaped, hovers, bounces or moves about before disappearing with a loud bang.

• 实际上他们所见到的是球状闪电，这种闪电，一般呈球状或梨形，在一声巨响之后，不会马上消失，而是在附近盘旋，弹跳或来回移动。