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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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流行音乐的历史与风格


流行音乐的历史与风格，是流行音乐文化发展中的重要一页，本门课程有助于学生把握流行音乐的发展历程和流行音乐的各种风格。
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中国经济学


从公共经济问题出发，比较中西方思想，并以儒法治理逻辑构建中国经济学的制度分析框架。
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离散数学


系统学习命题与一阶逻辑、集合、关系、图、树及代数系统，培养计算问题中的抽象建模与逻辑推理能力。
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秦汉考古


探索秦汉时期的考古发现，深入了解古代城址、墓葬、工商业遗迹。通过系统研究，揭示这个伟大帝国时期的历史文化面貌和社会经济发展。
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计算机组成原理


从计算机内部总体结构出发，解析运算、存储、指令、CPU、总线与输入输出系统的运行机理。
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操作系统


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数据结构


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旅游学基础


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