Traditional coal depositional model can hardly explain the cause of this extra-thick coal seam.
传统的煤沉积模式难以解释其超厚煤层的成因。
Please give me an extra thick book.
请给我再拿一本厚的书。
The thick, tar-like oil requires extra heat to flow.
这种石油浓稠、类似于柏油，要使它流动需要额外的热量。
The thick, tar-like oil requires extra heat to flow.
这种石油浓稠、类似于柏油，要使它流动需要额外的热量。
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