英语翻译During a cold start ,the air-fuel mixture drawn in by en

英语翻译During a cold start ,the air-fuel mixture drawn in by engine leans off.This due to the low turbulence at cranking speeds causing poor mixture of the fuel particles with the air ,and to the minimal evaporation of the fuel and wetting of the cylindet walls and intake ports with fuel at low temperatures.In order to compensate for these phenomena,and thus facilitate starting of the cold engine,additional fuel must be injectd during cranking.