... ratio calculator ==> 比例计算机,比例计算器 ratio change gears ==> 滚切交换挂轮架 ratio code ==> 恒比代码 ...
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Gears of first stage are changeable so that the operator can change the gear ratio based on current field condition.
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。
Because has cancelled the gear drive, therefore its velocity ratio may change at will, the speed change is smoother, has not shifted gears kicks the feeling.
由于取消了齿轮传动，因此其传动比可以随意变化，变速更加平顺，没有换挡的突跳感。
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