成煤环境奠定了煤中硫的分布基础，而顶板环境则是促使煤富硫、高硫的重要因素。

The coal forming environment has laid a foundation of sulfur occurrence in coal, while roof depositional environment is important and key link to make coal with high sulfur.

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高硫煤燃烧过程中的二氧化硫的排放是受到法律限制的。

The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law.

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一旦进入大洋，船舶就可以重新使用价格远比低硫燃油便宜的高硫燃油。

Once back on the ocean, ships could switch back to using high-sulphur fuel, which is much cheaper.

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But in terms of drugs that don't look like maybe this compound was used in the synthesis, many of them might have used thionyl chloride, because it generates such a nice reactive intermediate that you can go on and make a bunch of different compounds from that intermediate.

但是对于药物来说,它们可能跟合成过程中用到的这种化合物并不相像，很多药物的制造过程中都会用到亚硫酰氯，因为它能产生活性如此之高的反应中间体,以至于你可以继续利用反应中间体,来制造一堆不同类型的化合物。

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