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This textbook is liscensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0). To put it simply, for the materials that are directly displayed in this textbook (e.g., lesson texts, practices, audios, etc.), users may use them while giving appropriate attribution to authors of this textbook (and authors of the original texts if applicable). However, users may NOT use the materials for any commercial purposes. Here is an example of attribution for Lesson 4 Text 1 The Live Streaming Economy: 本文选自《开源中文》第四课《直播经济》，原文选自 Du Chinese 发布文章《直播经济》，有一些小改动。CC BY-NC-SA 4.0

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