In a nutshell lean simply means speed.
概括地说精益仅仅意味着速度。
In addition, the influence of the spark energy, the gas stream speed and the electrode distance on the lean ignition limit of the gasoline-air mixtures by an automobile ignition coil was determined.
此外，利用汽车发动机点火系统测试了电火花能量、来流速度、电极距离等因素对汽油-空气预混气的着火稀限的影响。
The results show that the effects of speed on the exhaust gas emission and fuel economy are related with the ratio value and the absolute time of lean burn and rich burn.
结果表明：稀燃发动机转速对其有害气体排放和燃油经济性的影响与稀燃吸附还原催化转化器稀燃运行时间与浓燃还原运行时间比值大小和绝对时间大小有关。
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