A submarine glided silently through the water.

艘潜水艇无声地在水中滑行。

Within a short time, everything on the submarine was buttoned up.

儿, 潜水艇内所有的东西都扣紧了。

A submarine surfaced outside the harbor.

潜水艇在港外到水面。

The submarine signaled for help.

潜水艇发出求救的信号。