It is a clean production process, which has been popularized in small-scale nitrogenous fertilizer factories.

双甲工艺是一种清洁生产工艺，它已逐步在小氮肥推广。

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Bought a new shirt, must wash before wearing, to remove the production process may exist in the dirt, to ensure that personal wearing clean health.

新买来的衬衫，须洗涤之后再穿，以除去生产过程中可能存在的脏污，确保贴身穿着时清洁卫。

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This paper introduced 4 kinds of modified FCC processes for production of clean gasoline, and compared productivity distribution and property of gasoline with traditional FCC process.

介绍了生产清洁汽油的4种催化裂化新工艺，并与催化裂化工艺在产率分布及汽油性质方面进行了对比。

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