1. Use a toothpick or other sharp object to apply glue or paste to the damaged area, and then stick it when the paper is dry.
2. Applying egg white to the damaged part can also play a role in repairing.
3. For the burr, you can smooth it with the nail surface, or polish it with a smooth hard object at the scratched place.
4. Paper books can be repaired with the same color paper.
The above methods are for reference only and can be selected according to the actual situation.