It’s only been latterly that we’ve discovered that it’s lots of individual reefs, around about 2,900 separate reef systems which make up the Great Barrier Reef.
直到近来我们才发现，它们其实是众多独立的礁石，
约有2900个独立的礁石
，
堡礁。
It’s only been latterly that we’ve discovered that it’s lots of individual reefs, around about 2,900 separate reef systems which make up the Great Barrier Reef.
直到近来我们才发现，它们其实是众多独立的礁石，约有2900个独立的礁石，堡礁。
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