Too often such smelting, like that pictured here in Vietnam, happens in backyards without any pollution controls.

像图中的越南，通常这样的熔炼在是距离住所很近而且没有任何污染控制的地方进行的。

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Heavy oil magnetization is a new, rather mature, simple and effective burning technology without any pollution.

重油磁化技术是一项新颖、比较成熟、简单有效而无污染的燃烧技术。

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Rare Earth(RE) elements possess integrated effects on modifying, refining and purifying of casting Al alloys without any pollution.

稀土合金具有变质、晶粒细化和净化铝合金的综合功能，而且对周围环境不产生任何污染。

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The plan says that "each party shall maintain a national system for responding promptly and effectively to oil pollution incidents" without requiring any clear details on the number of ships or personnel that would be needed to cope with a spillage.

BBC: Concerns raised over 'useless' Arctic oil spill plan