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durain

n.暗煤（硬块）

durain

durain

双语例句

1

By analyzing we can know that the Yanan Formation is mainly durain , with bright coal taking the second place .

分析可知延安组煤层以暗煤为主，亮煤次之。
2

Study of ESR characteristics of fusain and Durain

丝炭和暗煤的顺磁共振特性研究

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