《21世纪大学英语》（S版）系列教材（第3版）根据国家教育部颁布的《大学英语教学指南》（2020版）和《中国英语能力等级量表》以及我国高等院校人才培养特点和教学改革的最新成果编写而成，突出教育必须立德树人的时代要求，重视教学内容的实用性和针对性，在帮助学生培养正确的世界观、人生观和价值观的同时，将语言基础能力的培养与实际涉外交际能力的训练有机地结合起来，以满足新时代社会经济发展对大学生的要求。
本系列核心教材包括《综合教程》《综合练习》《教学参考书》（每一种分为1—4册）及配套的MP3、微课、助教PPT课件、“i学”App移动平台网络课程、超星“学习通”App示范教学包等。本套教材供高等院校普通英语教学使用。
本书为《综合教程》第3册，共8个单元，每个单元由导入、听、读、说、译和写、思辨以及轻松时刻等内容组成。导入（Lead-in）通过视频和相关练习引入话题并对整个单元作总体介绍，帮助学生了解本单元学习任务，激发学习兴趣。听（Listening）和说（Speaking）部分围绕每单元的主题，并结合大学生学习生活和毕业后工作的实际需要，进行听力与口语方面的专门训练。阅读板块包括Text A（精读）和Text B（泛读），并配有相应的练习。译（Translation）和写（Practical Writing）部分根据我国高等教育发展的特点和实际需求，提供以强化实用技能和整体素质为目标的实用训练。思辨（Critical Thinking）选取权威媒体资料，配以练习，旨在帮助学生树立正确的人生观和价值观，激发其创造力，增强思辨能力。本书最后还附有Grammar Review及相关练习，帮助学生复习和巩固语法知识。

1 Wearable Technology
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: What Is Wearable Technology?
Text B:A Look into the Future of Wearable Electronics
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Sales Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
2 Sustainable Living
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: Making Do Without the Minivan
Text B:A Day in a Greener Life
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Offer Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
3 Road to Success
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: Play to Your Strengths
Text B: The Language of Success
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Order Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
4 Space Technology
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: Eye in the Sky
Text B: Space Junk
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Confirmation Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
5 Travel
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: Around the World at 17
Text B: Travel School
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Verification Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
6 Teaching
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: What Makes a Master Teacher?
Text B: Getting Behind the Teacher's Desk
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Resignation Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
7 Construction
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: A Mile High in the Sky
Text B: World's Coolest Skyscraper
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Adjustment Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax
8 Code of Conduct
Part Ⅰ Lead-in
Part Ⅱ Listening
Part Ⅲ Reading
Text A: Real WorklABCs: Your Code of Conduct for Life (A-L)
Text B: Real WorktABCs: YourCode of Conduct for Life (M-Z)
Part Ⅳ Speaking
Part Ⅴ Translation & Writing (Price Increase Letters)
Part Ⅵ Critical Thinking
Part Ⅶ Time to Relax