Some oil companies are adding nitrogen to their gasoline. But does it cause pollution as well as boost performance a bit?
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?
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Mazda Motor Corp., Japan's second-largest car exporter, is developing a high-performancegasoline-engine car that achieves 32 kilometers (20 miles) per liter.