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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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East China University of Technology

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分析化学


系统学习滴定、误差与数据处理、质量控制，以及试样采集、分离富集等分析化学基础方法。
- XuetangX
- Self-Paced
- Free Online Course
江西自然美景与成因


从地质、地貌、水体、气象气候和生物等方面，系统解析江西自然美景的类型、分布及成景机制。
- XuetangX
- Self-Paced
- Free Online Course
爱上国乐


以二胡、琵琶、古筝等民族乐器为切入点，体验中国传统音乐经典与文化内涵。
- XuetangX
- Self-Paced
- Free Online Course
光电检测技术


光电检测技术是将光学与电子学技术紧密结合而产生的一门高新技术，它是利用电子技术来获取光信息或者借助光来获取其它信息的重要手段，该技术已渗透到许多学科并得到了飞速的发展
- XuetangX
- Self-Paced
- Free Online Course
材料力学


1．从知识性和趣味性的视角讲解材料力学的基本概念、基础理论和计算方法；2．运用材料力学进行力学问题的分析和计算；3．结合实际在教学中体现材料力学的在工程教育中的基础性应用价值。
- XuetangX
- Self-Paced
- Free Online Course
Mechanics of Materials

Applies stress, deformation, strength, and stability theories to engineering problems involving tension, torsion, bending, and combined loading.
- XuetangX
- Self-Paced
- Free Online Course
A Glimpse of Chinese Culture（中国文化概况）

An overview of Chinese culture spanning philosophy, literature, arts, education, science, festivals, food, clothing, architecture, and tourism.
- XuetangX
- Self-Paced
- Free Online Course
中国文化通论（日文）

在中国文化通论（日文）课程中，通过展示中国的基本国情、哲学与宗教、文学、艺术、科技、体育、节日、饮食、服饰、建筑和旅游等文化，学习用日语讲述中国故事。
- XuetangX
- Self-Paced
- Free Online Course
太极之从零开始（双语）

从零开始学习太极拳基本技法与经典动作，循序完成完整套路演练并了解太极桩功。
- XuetangX
- Self-Paced
- Free Online Course
健身气功之1568+（双语）

通过理论讲解与动作示范，系统学习易筋经、五禽戏、六字诀和八段锦等健身气功功法。
- XuetangX
- Self-Paced
- Free Online Course
Taiji Starts From Scratch(Bilingual Vertion)

Learn Tai Chi from scratch through foundational movements and a complete practice sequence, including core forms such as Cloud Hands, kicks, and closing.
- XuetangX
- Self-Paced
- Free Online Course
运动解剖学


【结构、形态、功能、运动、健康】结构决定功能，功能拓展运动；运动促进健康，健康重塑形态。生命在于运动，运动需懂人体。你运动吗？你健康吗？你了解人体吗？
- XuetangX
- Self-Paced
- Free Online Course
啦啦操运动


系统学习啦啦操基本动作、花球套路、队形编排与运动损伤预防，涵盖基础和进阶练习。
- XuetangX
- Self-Paced
- Free Online Course
Fitness Qigong 1568 + (Bilingual Version)

Explore Chinese fitness Qigong through theory and practice of four traditional methods—Yijinjing, Wuqinxi, Liuzijue, and Baduanjin.
- XuetangX
- Self-Paced
- Free Online Course
高级程序设计（C）

以案例驱动学习C语言，从算法与结构化程序设计出发，独立编写程序并处理实际问题。
- XuetangX
- Self-Paced
- Free Online Course

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