The older strata gradually disintegrate.
岩层渐渐风化。
The older strata gradually disintegrate.
岩层渐渐风化。
Results show that hydrogen-rich macerals are disintegrated while other macerals like fusain, and exinite are resistant to disintegration.
富氢煤显微组分被分解，
丝炭和角质等煤显微组分难分解。
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