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1. The Shiniulan Formationis a key part of the geologicalrecord.
石炭系是地质记录的关键部分。
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2. The study of the Shiniulan Formation has revealed many secrets aboutEarth's past.
研究石炭系揭示了地球过去的秘密。
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3. The Shiniulan Formation contains fossils that aremillions of years old.
石炭系含有数百万年历史的化石。