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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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声纳技术


系统讲解声纳信号、波束形成、目标测定与收发设备，并以航空反潜中的声纳浮标和吊放声纳为典型应用。
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模拟电子技术


从半导体器件出发，系统学习模拟信号的放大、反馈、滤波、振荡、功率放大与稳压电源电路。
- XuetangX
- Self-Paced
- Free Online Course
舰载战斗机技术与保障


系统介绍舰载战斗机的发展、机型、关键技术，以及航母上的起飞、着舰与保障流程。
- XuetangX
- Self-Paced
- Free Online Course
航空母舰


航母，全称航空母舰。航母以舰载机为主要作战兵力。本课程主要介绍航母编队、典型海空战例、俄乌战争、中国航母与舰载机。《航空母舰》MOOC，欢迎您的到来！
- XuetangX
- Self-Paced
- Free Online Course
舰载机导论


系统介绍固定翼舰载机、舰载直升机及倾转旋翼机的构造、气动特性、舰上起降与保障技术。
- XuetangX
- Self-Paced
- Free Online Course
舰载机概论


系统了解舰载机的发展历程、分类、关键技术及各类机型的使命任务与发展趋势。
- XuetangX
- Self-Paced
- Free Online Course
舰载机飞行、指挥


介绍舰载机指挥、起降与作战飞行技术，以及操稳特性和高速空气动力特性。
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飞机线路修理技术


系统训练导线、连接器、屏蔽层与航空线束的修理、装配和检测。
- XuetangX
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- Free Online Course
传输线与天线


从电磁场与电磁波出发，解析传输线中行波、驻波及各类天线的传输、辐射与测量原理。
- XuetangX
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- Free Online Course
无人机导航与飞行控制


介绍无人机导航系统与固定翼飞行控制系统的组成、工作原理和基础知识。
- XuetangX
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- Free Online Course
舰载机结构与系统


从舰载机的结构与工作系统入手，解析其组成、工作原理及舰上使用特点。
- XuetangX
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飞机用电安全知识


聚焦飞机维护中的静电、雷电、触电、火灾及空中断电安全防护与处置。
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带你走进1553B总线


围绕1553B总线的拓扑、组件、数据格式与通信机制，结合编码和消息格式实验，理解其在航空电子系统中的典型应用。
- XuetangX
- Self-Paced
- Free Online Course
飞机维护电气测量技术


围绕飞机维护中的电气测量，系统讲解测量标准、误差、设备及电阻电压电流和接地检测实操。
- XuetangX
- Self-Paced
- Free Online Course
航空电机与电器


围绕航空应用，讲解直流与交流电机、变压器及电路保护和控制装置的基本原理。
- XuetangX
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- Free Online Course

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