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Chasing 100M Daily Users, Duolingo Reconsiders Ads, Paying Influencers, and Its Most Expensive Plan

AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.

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二十世纪中国筝乐赏析


《二十世纪中国筝乐赏析》诠释二十世纪以来业已形成并持续传播的中国筝乐流派，即山东筝、河南筝、陕西筝、潮州筝、广东客家筝、浙江筝等。
- XuetangX
- Self-Paced
- Free Online Course
现代舞表演基础训练


通过舞蹈解剖学、身体感知训练与空间、音乐和道具想象，建立现代舞表演与创意编舞基础。
- XuetangX
- Self-Paced
- Free Online Course
多彩中华——中国民族民间舞蹈基础训练


以蒙古族、傣族、维吾尔族和朝鲜族民间舞的基础训练与风格组合，体验舞蹈背后的民族文化。
- XuetangX
- Self-Paced
- Free Online Course
Shadow Play—Seeking the Lost Shadow of China（皮影戏）

Explore Chinese shadow play through workshop-based puppet crafting and character design for Sheng, Dan, Jing, and Chou roles.
- XuetangX
- Self-Paced
- Free Online Course
商务英语口译


以真实商务场景模拟为主线，训练译前准备、口译笔记、谈判传译与跨文化商务沟通能力
- XuetangX
- Self-Paced
- Free Online Course
水文学原理


以水文循环和产汇流为主线，系统讲解降水、下渗、蒸发、径流及洪水演算等水文学基本理论。
- XuetangX
- Self-Paced
- Free Online Course
谈医说药


本课程是线下课程《药理学》的在线版，偏重于药物发现史及常用药物临床应用介绍，是课堂教学的有力补充。该课程属于临床医学与基础医学的桥梁学科，对医学生及药学生均有重要意义。
- XuetangX
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- Free Online Course
线性代数


系统学习线性代数核心概念与计算方法，涵盖行列式、矩阵、线性方程组、特征值及二次型。
- XuetangX
- Self-Paced
- Free Online Course
有机波谱分析（双语课程）

“有机波谱分析（双语课程）”帮助同学们了解和掌握有机波谱的基本概念、前沿技术和应用领域。希望能激发你们好奇心和乐趣，使在线学习成为生动有趣的学习旅程。
- XuetangX
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- Free Online Course
Approaching Nobel Prize in Chemistry

Explore the lives, discoveries, and scientific values of 21 Nobel Prize-winning chemists while tracing a century of chemistry’s development.
- XuetangX
- Self-Paced
- Free Online Course
Organic Spectroscopic Analysis

Builds practical foundations in identifying organic compound structures by combining MS, NMR, IR, Raman, UV-vis, XPS, and X-ray diffraction.
- XuetangX
- Self-Paced
- Free Online Course
计算机网络


以分层网络体系结构为主线，结合交换机、路由器与 VLAN 实验，学习构建中小型企业或校园网。
- XuetangX
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- Free Online Course
民族手工艺术——走进生活


想制作编织小物表达小小心情，想给他送去冬日的温暖，想给自己的家营造浪漫的氛围，让我们自己来亲手制作吧！请加入我们的民族手工艺术课程。在冬日里，让我们的生活更温暖，更美丽！
- XuetangX
- Self-Paced
- Free Online Course
艺术思政课


以声乐、舞蹈和表演融合思想政治教育，围绕民族精神、文化自信、人生观与理想信念开展艺术化育人。
- XuetangX
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- Free Online Course
环境规划与管理


系统学习环境规划与管理的理论、政策法规及分析方法，设计现实约束下的规划方案。
- XuetangX
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