What does it mean to shift into R gear in a car?

[MacRhett]

Shifting into R gear in a car refers to putting the car into reverse. The methods to shift into R gear include: 1. After depressing the clutch, directly shifting into the position marked R; 2. Pushing down and then shifting into the position marked R; 3. Lifting up and then pushing forward to shift into the position marked R; 4. Moving the gear lever to the left and then pushing it forward one notch to shift into the position marked R. When shifting into R gear, the following precautions should be taken: 1. Fully depress the car's clutch; 2. Ensure the safety button on the gear lever has been pressed; 3. The vehicle must be completely stopped; 4. Before shifting into R gear, observe the situation behind the car to avoid accidents.