Features and main functions 1) Broadcast teaching function 2) Teacher lecture 3) Teacher ask question 4) Dialogue individually 5) Students raise hand 6) Outside media play 7) Student's demonstration 8) Grouping teaching function 9) Group meeting 10) Teacher monitor 11) Teacher explain 12) Standardization exam function 13) Listening exam 14) Random exam 15) A/B paper exam 16) Oral exam 17) Exam analysis 18) Self-study function 19) Audio order 20) Text order 21) Repeat 22) Exam by oneself 23) Consult dictionary 24)Class name edit 25) Student name edit