variable gear ratio
... Variable-displacement pump变量(液压)泵 Variable gear ratio可变传动比 Variable lift cam变升程凸轮 ...
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可变传动比转向系统 AFSActive Front Steering ; ARSActive Rear Steering
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有些车的转向系角传动比是可变的，这种转向器采用齿轮齿条式，它在中间而不是外部，有不同的齿密度（每寸齿数）。
Some cars have variable-ratio steering, which uses a rack-and-pinion gear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.
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