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.
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）。
A rack-and-pinion gear set is enclosed in a metal tube, with each end of the rack protruding from the tube.
整个齿轮齿条式转向器装载金属壳内，其齿条从转向器伸出来与转向摇臂连接。
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