The Huanying, Volume 4 textbook covers the fourth year of study at the secondary school level. Like Volume 3, the textbook has 4 units and covers topics such as Transportation Has Become More Convenient, Regional Cuisines in China, Green Spring Festival, Commercials Everywhere, Employment, and Study Abroad. Each unit has Learning Goals, includes 5 lessons plus one unit review, and a Self-Assessment checklist. Within each lesson there are two dialogues or texts, a New Words section introducing vocabulary in simplified and traditional characters – as well as pinyin and English,- Language Notes that discuss grammar and usage structures through explanation and example, Extend Your Knowledge supplementary vocabulary, A Glimpse into Chinese Culture, and a Do You Know? section that offers additional cultural information. While the core of the textbook is written in simplified characters, the vocabulary is also presented in traditional characters in the main body of the text as well as in the Chinese-English, English-Chinese, and proper noun indexes at the back of the book. Dialogues are also included in traditional characters in a special index at the end of the textbook, to facilitate dual-character learning. Volume 4 introduces approximately 450 new characters with an additional estimated 200 supplementary vocabulary terms.