柯林斯詞典reef /ri?f/ (reefs) 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. 一道完好的珊瑚礁圍繞著海灣。2. N the part gathered in when sail area is reduced, as in a high wind 帆的可收縮部3. V to reduce the area of (sail) by taking in a reef 收帆 返回 reef劍橋詞典a line of rocks or sand just above or just below the surface of the sea , often dangerous to ships 礁；暗礁；礁脈 a dangerous offshore reef 靠近岸邊的危險(xiǎn)暗礁 a coral reef 珊瑚礁 返回 reef