Tricolor card is a training after Huang Ka training. The three-color cards are red cards, yellow cards and blue cards. Training methods, first do red card training. Tricolor vision is color vision with normal color discrimination ability. That is, all the perceived colors are produced by the mixture of red, green and blue, and each wavelength can be analyzed from white light.

Early education is the abbreviation of early education, which refers to the targeted guidance and training for children aged 0 to 6 according to the characteristics of children's physical and mental development and sensitive period, laying a good foundation for the cultivation of children's multiple intelligences and healthy personality.