reef
柯林斯词典
1. N-COUNT A reef is a long line of rocks or sand, the top of which is just above or just below the surface of the sea. 礁
An unspoiled coral reef encloses the bay. 一道完好的珊瑚礁围绕着海湾。
2. N the part gathered in when sail area is reduced, as in a high wind 帆的可收缩部
3. V to reduce the area of (sail) by taking in a reef 收帆
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