The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.
在外太空能看见大堡礁，它是有机生物构成的世界上最大的单一结构。
The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms.
在外太空能看见大堡礁，它是有机生物构成的世界上最大的单一结构。
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