Put your seatbelt on before starting engine: I read some time ago that on average we waste several hundred pounds / dollars (x2) of fuel by starting the engine and then putting on a seatbelt.

绑好安全带再发动： 不久前我读到一个数据，因为先发动汽车再系安全带，我们平均要浪费几百英镑/美元（x2）。

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The engine starting system provides air, fuel, ignition and torque for rotating the engine to an rpm at which the engine can accelerate to idle rpm.

发动机起动系统提供引气、燃油、点火及扭矩，以使发动机转动并加速到慢车所需的转速。

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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.

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；

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