The book can be used as an intensifying material for short-run classes with 60 ~ 80 studying hours, or used by language training classes with fewer weekly studying hours, or as self-teaching material. There are 20 ~ 25 phrases in each lesson in the Elementary Textbook, mostly using words from level-A. The Intermediate Textbook includes 25 ~ 30 phrases in each lesson, mostly using words from Level-C. They are selected based on the HSK outline but not limited to it. Frequently used phrases are given priority.