礁 礁石 暗礁英释
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
coral reef,珊瑚礁
barrier reef,堡礁；堤礁
great barrier reef,大堡礁
reef limestone,礁灰岩
reef flat,礁坪，浅石滩；平坦礁
submerged reef,暗礁
