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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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过程控制系统


围绕工业过程的建模、PID整定与串级、前馈等控制系统设计，结合典型工程实例讨论系统投运。
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大学计算机——计算思维的视角


全面培养学生的计算科学修养，信息素养，培养学生良好的计算思维能力，提高学生的计算机应用水平和计算机问题求解能力。
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Python大数据分析


以 NumPy、Pandas 为核心，学习使用 Python 完成数据加载、清洗、规整、可视化与时间序列分析。
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大数据导论


本课程面向理工科本科学生，着重介绍大数据采集、存储、访问和分析的趋势、问题、解决方案。
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计算机控制导论


以直接数字控制系统为例，学习计算机控制原理、数字控制器设计及工程实现。
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数据化企业


从智能制造、工业大数据和产品数据管理等视角，系统梳理企业从信息化走向数据化及工业互联网的路径。
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中国政治制度史


本课程将对我国上自夏朝、下迄清末时期政治制度的构成、功能进行介绍，分析探索我国古代政治制度演变的规律。让我们一起，在这里读懂华夏政制！
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汉语——直通HSK

以32课、64段情景化视频系统覆盖HSK三级的806个生词和85个基本语法。
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汉语词汇与词汇教学


系统学习汉语词汇教学理念、讲解技巧、练习设计与多元教学模式，提升国际中文教师的词汇教学能力。
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唐诗与唐代文化


这门课不是单纯的诗歌讲解，也不是仅仅介绍唐代历史，而是综合起来，以诗证史，以史解诗。更立体、更全面，更有趣！
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神韵诗研究


诗歌无“韵”则无“神”，欣赏诗歌如果不赏其神韵，则如雾里看花，终隔一层。这个课堂，教你如何欣赏诗歌之韵，做一个真正懂诗的人。
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英语学术论文写作


本课程旨在培养不同专业研究生的论文写作能力，使学生掌握写作章法，适应国际学术环境，提高论文发表能力，更自信地参与学术交流，为其未来的研究和职业生涯奠定坚实基础。
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文献学


本课程以杜泽逊《文献学概要》为教材，教材获首届全国优秀教材一等奖。课程旨在使不同专业研究生具备自觉的“文献意识”、“目录意识”、“校勘意识”和“版本意识”。
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系统探讨医学实践、研究与前沿技术中的伦理问题及伦理决策。
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以死观生，理解死亡、濒死体验与临终议题，缓解死亡恐惧并重新思考生命与人生规划。
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