在一个手动变速器里，当你操纵换挡杆从一个档位到另一个档位时，齿轮沿轴向滑动，使大小不同的齿轮进行啮合从而满足不同的传动比的需要。
In a manual transmission, gears slide along shafts as you move the shift lever from one position to another, engaging various sized gears as required in order to provide the correct gear ratio,.
研究表明，存在一个半接触角使得无级变速器在整个速比范围内，滑动率较小，自转角速度的绝对值较小，传动效率也较高。
The study shows that the slipping ratio is less, the spin angular velocity at traction contact point is also lower and the transmission efficiency is…
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