此外需要一个变速箱使燃动引擎更有效率，而这对于电动引擎就是不必要的累赘。

And, whereas a gearbox is needed to use the torque from a combustion engine efficiently, it is unnecessary with the heft of an electric motor.

youdao

研究试验结果表明，分层扫气可减少换气过程的燃料损失，使燃油消耗率大幅度下降； 使混合气空燃比的范围加大。

The result shows that stratified scavenging reduces fuel loss during air exchange greatly lowing the fuel consumption rate and enlarging the air-fuel ratio range.

youdao

我们使国家和公司围坐在圆桌旁，让它们一道清扫减少天然气燃除的障碍。

We bring the countries and the companies around the table so that they can work together to reduce the barriers to gas flaring reduction.

youdao