What are the differences between first, second, and third gears in a manual transmission?

[LaCassandra]

Manual transmission first, second, and third gears differ as follows: Different gear speeds: First gear is used for starting, with speeds up to 20 km/h; second gear is used between 20-40 km/h; while third gear can be used between forty to sixty km/h. Different driving conditions: First gear is the starting gear, used when the car begins to move. Its gear ratio is similar to that of reverse gear, with basically the same performance, so it is not suitable for sustained high-speed operation. Generally, you can shift to second gear once the car gains momentum; second gear is the passing gear, mainly used for navigating complex road surfaces and handling complicated situations; third gear is the transition gear, primarily used for low-speed driving in urban areas. Depending on the situation, you can conveniently shift up to fourth gear for acceleration or down to second gear for deceleration.