submarine [ˌsʌbməˈri:n]

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n.潜水艇；adj.水底的，海底的；vt.用潜艇袭击；vi.滑入...底下

a ship which can travel under water

Within a short time, everything on the submarine was buttoned up. 不一会儿，潜水艇内所有的东西都扣紧了。
The submarine signaled for help. 潜水艇发出求救的信号。