[单选题] The ______ system is used to reduce the air pollution caused by the engine.

1、[主观题]【英译中】ABS wheel speed sensors are isntalled at each wheel, and they transmit wheel and tire speed informaiton to the computer.

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2、[主观题]【英译中】The engine which is called the "heart" of a vehicle is used to supply power for an automobile. It includes the fuel, lubricating, cooling, ignition and starting systems. Generally, an automobile is operated by internal combustion engine. The internal combustion engine burns fuel within the cylinders and converts the expanding force of the combustion or "explosion" into rotary force used to propel the vehicle.

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3、[主观题]【中译英】转向螺杆不直接接触转向螺母的螺纹，其间装有很多钢球。

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4、[主观题]【英译中】The universal joint or U-joints is used to connect the drive shaft to the trasmission output shaft and the differentail pinion gear shaft.

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5、[主观题]【英译中】The internal combustion engine, as its name indicates, burns fuel within the cylinders and converts the expanding force of the combustion into rotary force used to propel the vehicle. The actions taking place in the engine cylinder can be classified into four stages, or strokes. "Stroke" refers to piston movement; a stroke occurs when the piston moves from one limiting position to the other. The upper limit of piston movement is called TDC (top dead center) .The lower limit of piston movement is called BDC (bottom dead center). A stroke is piston movement from TDC to BDC or from BDC to TDC. In other words, the piston completes a stroke each time it changes its direction of motion.

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