欧洲年久老旧的炼油厂无法加工更重质的沙特原油，且这里的燃料规定对硫磺含量没世界其他地方那么宽容。

Europe's creaky old refineries will not be able to process the heavier Saudi crude, and fuel regulations there are less tolerant of sulphur content than elsewhere in the world.

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因此，植物燃烧不像煤碳和石油之类的化石燃料，它们在燃烧过程中不会增加大气中的碳含量。

So unlike with fossil fuels such as coal and oil, burning them does not add new carbon to the atmosphere.

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为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。

To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.

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