Preview = no need to do, review = no homework, dictation = copy, deskmates correct each other = all correct, writing = copy online, parent signature = sign by yourself, no need to hand it in tomorrow = no need to write today, group Discussion = group chat, open class = practicing acting skills. Students are a professional position in people's studies. Different words will have different meanings in the eyes of students. For example, preview = no need to do, review = no homework, dictation = copying, deskmates correcting each other = all correct, writing Composition = copy online, parent signature = sign by yourself, no need to hand it in tomorrow = no need to write today, group discussion = group chat, open class = practice acting skills, etc. are all meanings that students understand.