Besonderhede van voorbeeld: -3109926578219611081

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English[en]
Quartzite rocks are so hard that they can be rolled long distances without disintegrating like most other rocks would do.
Korean[ko]
규암은 매우 단단해서 다른 대부분의 암석들처럼 깨어지지 않은 채 장거리를 굴러갈 수 있다.

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