Import must be targeted. Design this link closely with the teaching objectives and requirements of this course, instead of blindly pursuing novelty, strangeness and uniqueness in form without specific content and entering the misunderstanding of "putting on a show".

(2) Interest

It is very important to arrange some interesting links when importing, but the fun of selecting materials must be healthy and elegant. It is necessary not only to satisfy or stimulate students' interest in learning and desire for knowledge, but also to have "exemplary aesthetic taste". It is not a one-sided pursuit of fun or fun for fun's sake, but a positive aesthetic sentiment and the pursuit of taste first. Therefore, teachers are required to have high aesthetic quality, rich subject knowledge and solid practical experience, so as to guide students to enter a better realm, move towards a better life and create their own beautiful life.

(3) Enlightenment

The enlightenment of entry should be based on a good atmosphere suitable for learning. First of all, we should give students psychological comfort and spiritual encouragement in appropriate ways to start their thinking and make them more active. At the same time, we should pay attention to the connection between old and new knowledge. From the known to the unknown, we should "review the old and learn the new"

(4) artistry

Import should be artistic. Lead-in is a kind of bedding and a reasonable accidental design; It can also be a suspense, an arrangement that can arouse curiosity and desire to explore; It is a kind of attraction, a kind of concern that people can't give up ... It can make use of the existing rich materials, deduce wonderful situations through proper arrangements, reflect the beauty of time and place, attract students' visual attention, and produce psychological * * * in the deep heart to better "mobilize" attention.

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