A gearbox is a part of a vehicle's transmission system that helps control the speed and force of the engine. It contains a set of gears that can be shifted to change how much power is sent to the wheels. By changing gears, the gearbox allows the vehicle to move at different speeds and helps the engine run more efficiently. In manual cars, the driver controls the gears using a gear stick, while in automatic cars, the gearbox shifts gears automatically based on the vehicle's speed and load. A well-functioning gearbox ensures smooth and reliable driving.

英語での「gearbox」の定義と意味

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