不像来自那些污秽场所的肉，它不会污染河流和小溪，不会大量消耗地下水，也不会引起滥伐森林。
Unlike meat from those filthy places, it will not pollute rivers and streams, deplete groundwater or cause deforestation.
有些石油公司向汽油里加氮。这提高了汽油的性能，但会不会引起污染呢？
Some oil companies are adding nitrogen to their gasoline. But does it cause pollution as well as boost performance a bit?
这提高了汽油的性能，但会不会引起污染呢？
But does it cause pollution as well as boost performance a bit?
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