pollution free meaning in English

无污染的

Synthesize of the pollution free solventliss resin
环保型无溶剂漆用树脂的合成
The inserting pin with fixed structure which does not need oiling is pollution free and maintenance free
插针采用固定构造，完全不用加油，无污染，无维护成本。
Accessible and pollution free pedestrian facilities and adequately wide footpath with proper street furniture and landscaping should be provided
行人路要宽阔，设有适当的街道设施和进行景观美化。
A fuel cell converts hydrogen and oxygen directly into energy with heat and water as by - products , making it almost pollution free
燃料电池可以在几乎不产生任何污染物的情况下将氢和氧直接转化为能源，而其副产品则为热量和水分。

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