A boat sailing against the current must forge ahead or it will be driven back.

逆水行舟,不进则退.

《现代汉英综合大词典》

I'm a boat, sailing on the ocean.

我是一艘小船, 航行在海上.

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I'm a boat, sailing very slow.

我是一艘小船, 开得非常慢.

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Mark Twain started out working on a boat sailing up and down the Mississippi.

安德鲁?卡耐基开始工作时是在一家棉纺厂当线轴工.

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Another is soldiers dug a hole that through the sea can contain a small boat sailing.

另外有一条是士兵挖掘可以通往大海的隧道,可容纳一条小船航行.

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But you do have a boat sailing that day?

可那天不是有船 吗 ?

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