When you start a V-8 engine, you are only driving two cylinders (1 liter) through their compression strokes, but with one big cylinder you would have to compress 4 liters instead.

当你启动V - 8发动机时，只是通过压缩冲程驱动了两个气缸(1升)，但是如果是一个大气缸你必须要压缩4升。

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A new cylinder type ultrasonic motor with multi-degree of freedom was developed based on increasing its driving efficiency and improving its output characteristics.

从提高驱动效率、改善输出性能的角度出发，研制了一台新结构形式的圆柱形多自由度超声电机，对电机定子的工作模态和电机的输出性能进行了测试。

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Cylinder front-mounted, the driving force is transmitted through a wedge mechanism. With high stability and reliability.

油缸前置，驱动力通过斜楔机构传递。工作稳定可靠。

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Still, total fuel costs for driving a diesel Passat on a long highway trip are about 20% less than driving a four-cylinder gasoline Passat, rated at 31 mpg highway.

WSJ: Are Diesels Poised for a Comeback?

One sign that the world is improving is that hybrid vehicles such as the Escape don't feel like a chore, or as if you're driving them because you would feel more guilty if you bought a 12-cylinder Mercedes from DaimlerChrysler (nyse: DCX - news - people ).

FORBES: Forbes First Drive: The First American Hybrid