A submarine glided silently through the water.
一艘

无声地在
中滑行。
A submarine glided silently through the water.
一艘

无声地在
中滑行。
Within a short time, everything on the submarine was buttoned up.
不一会儿, 

内所有的东西都扣紧了。
A submarine surfaced outside the harbor.


在港外
到
面。
The submarine signaled for help.


发出求救的信号。
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