What has turned the lowly four-banger into such a ready replacement for its bigger brethren is the widespread use of turbo-charging and directfuelinjection.
卑微的四缸引擎能如此迅速地替代其他更多缸数的引擎的原因是废气涡轮增压和燃油直喷技术的广泛使用。
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At Ford, with the internal-combustion engine and directfuelinjection, we're making a 25 percent improvement in miles per gallon and we're reducing CO2 [emissions] by 15 percent.