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천연 진주는 어떻게 형성되나요?
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A
진주층 침전이라는 과정을 통해
B
그것들은 나무에서 자랍니다.
C
그것들은 인간에 의해 만들어집니다.
D
그것들은 지구의 지각에서 발견됩니다.
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