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1.The car's engine has an optional gear ratio that allows for easy shifting between speeds.
这辆车的引擎有一个可选的齿轮比，可以轻松地在速度之间切换。
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2.In the automotive industry, an optional gear ratio is a feature that allows drivers to adjust the transmission settings based on their driving conditions.
在汽车工业中，可选的齿轮比是一个特性，允许驾驶员根据他们的驾驶条件调整变速器设置。
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3. The engineers at the auto parts manufacturer are constantly working on improving the optional gear ratioof their products to meet the demands of modern vehicles.
这家汽车零件制造商的工程师们一直在努力改进他们的产品的可选齿轮比，以满足现代车辆的需求。