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But motors could be fitted to the front wheels as well to provide four-wheel drive.

但是也可以通过在前轮上安装电动机来实现四轮驱动。

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The rusty iron chain that double-locked the cart to the front wheels of the cycle began to squeal as he rode.

三轮车前面轮胎上双重锁上的铁链生了锈，在骑动的时候发出刺耳的声音。

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The power from the engine pushes the car forward from the back wheels instead of pulling it forward with the front wheels.

VOA: special.2009.04.10

But Phnom Penh has its cyclo - a three-wheeled bicycle with the driver perched on high above the rear wheel, and the passengers in a bucket seat slung between the two front wheels.

VOA: standard.2010.06.14

The gasoline engine drives the front wheels, but it also sends some current to the batteries.

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Wheego has moved the battery pack forward, putting more weight on the front wheels.

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Then during acceleration, that energy moves to the front wheels, which support the combustion engine.

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