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Graphite deposit of Heye was formed by metamorphism of the Permian coal bed.
荷叶石墨矿是由二叠系煤层变质而成的石墨矿床,石墨与煤呈同层异矿关系.
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Plum surname goatherd drives domestic Yang Heye's goat into boundless and indistinct llano together.
李姓牧羊人则把家羊和野山羊一起赶进了茫茫大草原.
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