单语范例（未经PONS编辑处理）
Most manufacturers tune for optimum emissions (running rich to protect the catalytic converter) and fuel economy purposes which can limit performance.
en.wikipedia.org The band's live performance received some poor reviews in the music press during this time.
en.wikipedia.org This enables the prediction of attributes such as vehicle performance, fuel economy and driveability.
en.wikipedia.org Such effects are typically only felt at very high speeds, making ram air primarily useful for racing, not street performance.
en.wikipedia.org It was not only her performances on the court which were noted, however.
en.wikipedia.org