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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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应用密码学


系统学习现代密码学及其在信息安全中的应用，涵盖分组密码、序列密码、公钥密码、数字签名、密钥管理与密码协议。
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高电压绝缘技术


聚焦高电压下各种电介质的绝缘特性、绝缘试验与电力系统过电压防护。
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钢结构设计原理


学习钢结构材料、连接、稳定性及基本构件的设计计算与构造方法。
- XuetangX
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- Free Online Course
计算机图形学导论


本课程讲解图形的生成原理和处理方法，并配有基于OpenGL的图形编程技术的讲解，促进学生掌握主流开发库、开发工具，理论与实践相结合，为开发图形应用打下基础。
- XuetangX
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操作系统


以 Linux 为基础系统讲解操作系统原理，并通过安装、C 编程、进程控制和进程通信实验巩固理解。
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营销在移动互联网时代


比较传统营销与移动互联网时代营销，解析新营销思维、价值创造、消费者行为及数字化营销案例。
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重症医学


围绕危重患者识别、动态监测与器官支持，系统介绍重症医学的临床救治与操作技术。
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医学分子遗传学


医学分子遗传学专注于疾病与遗传的关系，从分子水平研究基因的结构、功能以及突变的效应，探讨遗传病发生、发展规律，为遗传病的诊断、治疗和预防提供理论依据和技术手段。
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精准医学基础


从遗传、组学与表型差异出发，学习精准医学研究方法及其在个体化诊疗中的应用。
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你身边的妇产科学


系统认识异常妊娠、分娩并发症、妇科疾病、微创技术与辅助生殖等妇产科临床问题。
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医学免疫学


聚焦免疫相关疾病机制及免疫检测、预防与治疗技术，系统串联B细胞、T细胞、固有免疫、肿瘤与移植免疫。
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儿科学新进展


本课程突显儿科各亚专业的现状和最新研究进展，紧密结合科研方法和临床实用操作，有助于学生掌握儿科学基础理论知识和技能，培养缜密的儿科临床思维和分析能力。
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临床病理学


系统学习临床病理诊断流程、辅助检测技术及多系统疾病和肿瘤的病理分类与诊断。
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制药工艺学


聚焦药物工艺路线的设计、优化与放大，涵盖催化、手性制备、发酵制药及生物药生产技术。
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医学细胞生物学进展


面向医学研究生，系统解析细胞结构、功能及其与疾病发生相关的前沿机制。
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