(1) Teachers should take a direct approach to students with bile, but don't irritate these students easily. They should be persuasive in their severe criticism, cultivate their self-control, stick to the end and be bold and enterprising. ?

(2) Students with blood quality can be educated in various ways, but they should be reminded regularly and severely criticized for their shortcomings. Teachers should encourage them to overcome difficulties, cultivate their practical and single-minded spirit, prevent them from changing their minds, create conditions, give them more opportunities for activities, and cultivate their advantages of vigor and resourcefulness. ?

(3) For mucinous students, teachers should adopt the way of patient education, so that they have enough time to think and react, and cultivate their youthful spirit, warm and cheerful personality, and the advantages of being honest and being practical and tenacious. ?

(4) For depressed students, we should take euphemistic hints, show more care and love to them, and don't criticize them in public or too severely, so as to cultivate their friendly, sociable and confident spirit and cultivate their advantages of sensitivity, wit, seriousness, carefulness and strong self-esteem.