1. The transmission gear or corresponding gear ratio used to produce the range of lowest drive speeds in a motor vehicle. 
   头档，低速齿轮限定机动车辆最低驾驶速度范围的传动齿轮或对应齿轮的比率
2. Of, relating to, or being the transmission gear or corresponding gear ratio used to produce the range of lowest drive speeds in a motor vehicle. 
   头档的，低速齿轮的限定机动车辆最低驾驶速度范围的传动齿轮或对应齿轮比率的或与之有关的
3. The spirally threaded shaft of a worm gear. 
   螺纹蜗轮的刻有螺旋线的柄
4. A driving gear is different from a drive gear. 
   一个主动轮是不同于一个被动轮的。
5. The low gear configuration of a transmission. 
   低速齿轮传动的低速齿轮构造

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