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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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教育原理


以中小学职前教师培养为主线，系统梳理教育目的、师生关系、教学、课程、德育与教育实践。
- XuetangX
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高级运筹学


系统讲授多类高级运筹学理论、优化算法及其软件编程实现，面向工程优化决策。
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新时代中国特色社会主义理论与实践


系统学习新时代中国特色社会主义理论与实践，理解习近平新时代中国特色社会主义思想，并运用马克思主义立场、观点和方法分析、解决问题。
- XuetangX
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- Free Online Course
潜水和高气压医学


本课程系统将讲述从事潜水和高气压医学保障所必需的理论知识，使研究生具备处置潜水疾病以及利用高气压手段治疗临床适应症的基本能力，掌握开展潜水和高气压医学科研的基本知识和技能。
- XuetangX
- Self-Paced
- Free Online Course
循证医学


围绕临床问题，学习证据检索、质量分级、循证决策，以及系统评价和Meta分析等循证医学方法。
- XuetangX
- Self-Paced
- Free Online Course
神经解剖与脑立体定位


系统学习人体神经系统形态结构，并掌握鼠脑立体定位、脑片解读及切片制备染色的基础技能
- XuetangX
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- Free Online Course
生物光镜标本技术


学习从光学显微镜制片、染色与组织化学处理，到显微摄影及图像分析的完整技术流程。
- XuetangX
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纤维新材料及应用


聚焦碳纤维、芳纶、陶瓷纤维及纳米纤维等新材料的类型与应用。
- XuetangX
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智能控制技术


系统讲解模糊控制、神经网络控制与深度学习，涵盖控制器设计、系统仿真及遗传算法等智能控制优化方法。
- XuetangX
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- Free Online Course
现代机械制造理论与技术


《现代机械制造理论与技术》课程面向智能装备制造，聚焦先进制造技术，深入浅出，细致入微，图文并茂，精益求精，将加工理论与应用实例有机结合，在教学过程中厚植家国情怀，培育工匠精神。
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- Free Online Course
美术理论与批评


《美术理论与批评》是美术学一级学科学术学位研究生的核心课程，旨在通过美术批评史论的讲授、九种实用批评理论的呈现和批评实践的演示，引导学生掌握美术批评的实用方法。
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教育研究方法


以案例教学贯穿教育研究全过程，涵盖定量、质性、混合与行动研究方法及研究成果写作。
- XuetangX
- Self-Paced
- Free Online Course
硕士英语


围绕学术阅读、写作、翻译与研究能力，帮助研究生适应科研工作。
- XuetangX
- Self-Paced
- Free Online Course
通信网理论基础


围绕马尔可夫与非马尔可夫排队模型，学习 G/G/1 近似解和优先级调度，以建模分析通信系统性能。
- XuetangX
- Self-Paced
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中外美术史


以跨文化比较视角对照中国古代绘画与西方现代艺术思潮，培养艺术批评能力。
- XuetangX
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