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.
混合气的浓度比例可以改变，以适应发动机的运行状况。汽车在启动、加速和高速行驶时，需要含燃油浓度较高的混合气；
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.
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