Volume III is mainly dialogues with some short essays interspersed; volume IV is a combination of dialogues and essays. In the last two volumes, a small amount of written language is appropriately added. "Conversation exercises: including: reading dialogues, and expression training. "Exercise" and "Textbook" are parallel packages, and users can choose to use them according to specific situations. The new words in this textbook are arranged in traditional and simplified Chinese characters, and only simplified Chinese characters are used in other parts.