美国和法国使用的标准的方法，如同柴油机工作原理，将燃料一直压缩，直至点燃。
The standard approach, being pursued in America and France, works like a diesel engine by compressing the fuel until it ignites.
柴油发动机内没有火花塞，取而代之的是将柴油喷入发动机气缸，然后压缩冲程在高温高压下引起燃料点火。
In a diesel engine, there is no spark plug. Instead, diesel fuel is injected into the cylinder, and the heat and pressure of the compression stroke cause the fuel to ignite.
有些卡车已经使用清洁柴油引擎。其它一些卡车也有使用压缩或液化天然气燃料的。
Some trucks now run on cleaner burning diesel fuel engines, while others are using compressed or liquefied natural gas.
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