Slight variations in fuel even from bag to bag are inevitable, but the differences are usually insignificant and much smaller than found in the original raw material before processing.
每袋燃料有细微变化是不可避免的，但这差异通常是微不足道的，比原材料加工前要小得多。
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In the US, pellet mills across the country receive, sort, grind, dry, compress, and bag wood and other biomass waste products into a conveniently handled fuel.