The compressed-air powered engine mode is to change the pressure of compressed air into mechanical energy, and there are no pollutant emissions.

压缩空气动力模式是将压缩空气的压力能转化为曲轴旋转的机械能，没有污染排放。

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The operating principle of internal-combustion engine mode is similar to the four-stroke internal combustion engine, so it will inevitably produce harmful emissions.

内燃机模式的工作原理与普通四冲程内燃机相同，因此不可避免的也会产生有害排放物。

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Volt enthusiasts like to recite the fact that the Volt can go 35 miles on battery-power and then shift seamlessly into gasoline-engine mode, saving on gas and reducing emissions of greenhouse gases.

追捧Volt的人津津乐道的一个事实是：Volt能用电行驶35英里后，平顺地切换到汽油机模式，由此能节省燃油，减少温室气体排放。

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The C-Max Energi has an EV mode button on the center stack that lets the driver choose between three modes: electric-only driving, normal hybrid mode (which blends electric and gasoline engine power as appropriate) or EV-later mode, which reserves the battery pack power for later use.

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The parallel full hybrid system developed by Porsche also offers "coasting" at higher speeds, a mode wherein the internal combustion engine is turned off and the electric motors use vehicle momentum to generate electricity that is stored in the lithium-ion battery.

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Boosting: When very sporty performance is required, the electric motors form an alliance with the TDI engine known as "boosting": in this mode, all four wheels are driven.

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