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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.

Dhawal Shah Sep 03, 2026

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系统安全评估原理


通过本课程学习，使学生了解安全评估现状及发展趋势，掌握安全评估原理与基本方法，掌握重大事故后果评估方法，掌握针对某一行业安全评估方法选取与应用的原则与基本技巧。
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现代探测技术


通过本课程学习, 使研究生掌握现代光学探测技术相关器件特性、系统设计及典型应用, 为专业知识的学习与应用打下必要的基础；培养学生独立分析问题、解决问题的能力及创新意识。
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- Free Online Course
最优与鲁棒控制


系统讲解变分法、动态规划与庞特里亚金最小值原理在连续和离散最优控制中的应用。
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微波遥感与信道建模


面向5G/6G通信、遥感与智慧城市等关键领域，系统讲授雷达遥感与信道建模核心方法，培养学生跨学科科研能力与国际化工程视野，是电子信息研究生不可或缺的专业课程。
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化工设计与实践I

展开化工设计学习的学员务必先知，本课程视频内容虽然简短易学，但是后面的实例繁多。如果学而不时时习之，就会有化工设计的规矩森严，瓶颈坚固之感。如果按部就班，勤加练习，就会受益良多。
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Biomedical Optics and Photonics

The course "Biomedical Optics and Photonics" introduces the historical development, fundamental principles, and modern applications of light in medicine and life sciences.
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基因工程


基因工程是生命科学与生物技术的重要基础。本课程聚焦基因重组核心流程，帮助学习者掌握实验逻辑，提升方案设计与分析能力，为科研训练与产业应用奠定基础。
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人工智能与计算科学


人工智能与计算机科学是人工智能时代学习各种领域工科知识的基础，了解人工智能的基本概念和原理，才能应用AI的知识、工具和方法辅助复杂工程问题的解决。
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车辆动力学


系统学习轮胎、悬架、转向摆振及车辆侧向与垂向动力学的数学建模与分析。
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微电子电路基础


介绍基于MOS晶体管的微电子电路的基础知识。包括MOS晶体管的工作原理，MOS晶体管组成的模拟电路和数字电路。
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机械原理


系统学习平面机构的运动与受力分析，以及连杆、凸轮、齿轮、轮系的设计、运转调节和机械平衡。
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网络安全-应用技术与工程实践


系统梳理网络空间安全技术体系，从加密认证、防火墙与入侵检测到云计算、物联网和区块链安全，强调工程实践。
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工程伦理


从责任、公正、环境伦理到职业规范，系统分析工程实践中工程师将面对的共性伦理问题。
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电工和电子技术 II

从组合与时序逻辑、变压器和电动机到S7-1200，学习分析与设计电气控制系统。
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内燃机原理


《内燃机原理》课程是以车用内燃机为对象，系统讲授性能指标、燃料燃烧、汽油机原理、柴油机原理以及内燃机特性及排放等知识点。
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