二冲程汽油机排气污染严重，尤其是燃烧混合油、浓混合气时有害物排放量大。
In a two-stroke gasoline engine, exhaust gas pollution is especially severe when it burns rich mixture of blended fuel.
由于这个原因，要使发动机迅速启动，必须通过化油器向每个汽缸提供浓的可燃混合气。
For this reason, it is necessary to provide extremely rich mixture from the carburetor in order to provide sufficient combustible mixture to all cylinders for quick starting.
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）。
When the engine is cold, for example, then the mixture must be rich ( have a high proportion of fuel).
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。
For maximum engine power, a rich fuel mixture is mandatory in order for the combustion process to consume all the oxygen in the air entering the combustion chamber.
混合气偏浓，循环变动明显减小。
Cycle-to-cycle variations decrease markedly with richer mixture.
混合气偏浓，循环变动明显减小。
Cycle-to-cycle variations decrease markedly with richer mixture.
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