reef

礁，礁石，暗礁英释nna line of sharp rocks, often made of coral, or a raised area of sand near the surface of the sea

1 coral reef,珊瑚礁

2 barrier reef,堡礁；堤礁

3 great barrier reef,大堡礁

4 reef limestone,礁灰岩

5 reef flat,礁坪，浅石滩；平坦礁

6 submerged reef,暗礁

1 a proposal to protect several miles of thousand-year-old coral reef.保护绵延数英里的千年古珊瑚礁的提案