No doubt they were at their windows gawking at the huge vapor trail in the sky when the shock wave hit.

毫无疑问，当冲击波袭来时，他们正呆在窗前，呆呆地望着天空中巨大的波冲击。

So you jump up -- I mean, there is nothing left of you but a vapor trail.

所以你跳了起来——我的意思是， 你什么都没有留下， 只剩下一条蒸汽痕迹。

I glanced up to find two vapor trails heading off to the west in perfect parallel, like tram tracks.

我抬头一看，发现两条蒸汽轨迹完全平行地向西延伸，就像电车轨道一样。