渔船在海上漂泊了三天才返航。

The fishing boat was at sea for three days before returning.

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The fishing boat was at sea for three days before returning.

at sea 是一个固定短语,由介词 at 和名词 sea 组成。sea 指"海洋"。 at sea 字面意思是"在海上",引申为"在航行中"或"漂泊在海上"的状态。

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