For maximum engine power, a richfuelmixture is mandatory in order for the combustion process to consume all the oxygen in the air entering the combustion chamber.
在发动机最大功率的工况下，燃烧过程中浓的可燃混合气会将燃烧室中的所有空气消耗完。
2
When the engine is cold, for example, then the mixture must be rich ( have a high proportion of fuel).
例如，当发动机冷车时，就必须提供较浓的混合气（具有较高的燃油比例）。
3
The mixture must be of varying degrees of richness to suit engine operating conditions. It must be rich (have a higher percentage of fuel) for starting, acceleration, and high-speed operation.