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1.The geologist is conducting a rock classification study in the field.
地质学家正在野外进行岩石分类研究。
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2. The rock classification system is crucial for understanding the earth's history.
岩石分类系统对于理解地球历史至关重要。
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3. The rock classification helps us understand the different types of rocks found in the area.
岩石分类帮助我们了解该地区发现的不同类型的岩石。