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大堡(bǎo)礁(jiāo)由2600多座珊瑚(shān hú)礁和约600座石灰岩岛构成,是世界上最大的珊瑚礁岛群。
The bǎo reef (jiāo) is composed of more than 2,600 reefs and about 600 limestone islands, making it the largest coral reef island in the world.