齿数比，英文名称gearratio，是指齿轮副中，大轮齿数与小轮齿数的比值。
注意到主动齿轮的齿数比冠状齿轮少。
Note that the input pinion is a smaller gear than the ring gear.
汉译：转递比取决于两个啮合齿轮的齿数比。
The transmission ratio is dependent upon the ratio of the number of teeth of the meshing gear wheels.
第一级传动齿可变，驾驶员可根据电流与磁场情况来改变齿数比。
Gears of first stage are changeable so that the operator can change the gear ratio based on current field condition.
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