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Công bố các phát hiện mới trong chuyến thám hiểm sông ngầm trong hang Sơn Đoòng

Với những phát hiện mới từ chuyến thám hiểm sông ngầm trong hang Sơn Đoòng – hang động lớn nhất thế giới, Sơn Đoòng càng trở nên bí ẩn hơn đối các chuyên gia hang động và giới khoa học. Đây là  phát biểu của ...

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