Fan Deng's wearing a red vest when reading is a visual expression, which comes from the red vest worn by Fan Deng, a writer in China, at the reading sharing meeting. This metaphor means that through reading and learning, individuals can improve their knowledge and ability and become more confident and attractive.

The red vest symbolizes vitality, self-confidence and charm. By showing his reading achievements and sharing spirit, Fan Deng conveys positive energy and encouragement to the audience, which is like wearing a red vest.

Therefore, "Fan Deng wears a red vest when studying" has become a slogan to encourage people to study, which means that through continuous learning, we can gain inner confidence and external success, and make ourselves more attractive and influential.