You have 12 vertical launch tubes.

你有12个垂直发射管。

So it is what propels it out so when you see the footage of a missile coming out of a ship, it is the plume that gets it out of that vertical launch.

所以当你看到一个导弹从一艘船上发射出来的画面时，正是羽流把它从垂直的发射中推了出来。