What does 'one gear per clutch' mean?

[AlyssaLee]

Press the clutch pedal all the way down, shift into one gear, then release the clutch. When the clutch is pressed down and released, only one gear can be engaged. This is called 'one gear per clutch'. Below is relevant information about vehicle gear shifting: 1. Precautions: When downshifting, the method of double-clutching plus one blip of the throttle should be used. The principle of downshifting with throttle blip is: higher speed requires a bigger 'throttle blip', lower speed requires a smaller one; lower engine speed requires a bigger 'throttle blip', higher speed requires a smaller one; flat roads require a bigger 'throttle blip', uphill requires a smaller one. 2. Techniques: Gear shifting should be timely, accurate, smooth, and quick. When starting a car, generally use the low gear (first gear). After starting, as long as road conditions permit, quickly and timely shift up through the gears to higher gears.