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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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（自主模式）概率论与数理统计


此门课程为概率论与数理统计主课程。此外，我们专门为此本课程配套了概率论与数理统计典型例题题解，将和概率论与数理统计主课程同步上线。
- XuetangX
- Self-Paced
- Free Online Course
研究生心理健康讲座——关爱自己从心理健康开始


“没有精神健康就没有健康”，关爱自己，从心理健康开始。
- XuetangX
- Self-Paced
- Free Online Course
线性代数


系统讲解有限维空间的线性理论与方法，涵盖行列式、矩阵、向量、线性方程组及特征值与特征向量。
- XuetangX
- Self-Paced
- Free Online Course
土力学


系统讲解土体强度、变形、渗流与稳定性的基本原理及工程分析计算方法。
- XuetangX
- Self-Paced
- Free Online Course
An Introduction for Life Science

A cross-scale introduction to modern life science, connecting genetic information and microbes with plant diversity, animal development, and environmental relationships.
- XuetangX
- Self-Paced
- Free Online Course
专业课程设计2-装配式机房


以BIM完成装配式机房的机电深化设计、构件建模与施工组织安装进度模拟。
- XuetangX
- Self-Paced
- Free Online Course
C++语言程序设计


以 C++ 为载体，系统学习结构化与面向对象程序设计，并通过类、继承、多态和标准库编写大型程序。
- XuetangX
- Self-Paced
- Free Online Course
土木工程材料


系统介绍土木工程中石材、胶凝材料、水泥、混凝土、砂浆、钢材、木材、沥青及保温吸声材料的性质与应用。
- XuetangX
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- Free Online Course
流体力学


以丰富例题和融入基础数学的教学方式，结合工程实际讲授理想流体、粘性流体及翼型叶栅理论。
- XuetangX
- Self-Paced
- Free Online Course
食品安全与日常饮食


《食品安全与日常饮食》课程的目的是帮助学生树立正确的食品安全意识、了解工业化食品生产过程、辨识食品安全风险因素。本门课程是一门具有很强的科学性、实用性和综合性的科普课程。
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- Self-Paced
- Free Online Course
土木工程概论


土木工程专业的新生都要选择“土木工程概论”课，期望从中了解行业背景、取得的成就和未来的职业前景。通过课程学习，使学生了解土木工程的方方面面，从而激发那份学习的热情与探索的欲望。
- XuetangX
- Self-Paced
- Free Online Course
农产品加工学-粮油加工


聚焦谷物与油料的加工工程，涵盖稻米制米、小麦制粉、玉米和大豆深加工及植物油提取与精炼。
- XuetangX
- Self-Paced
- Free Online Course
热力发电厂


系统讲解热力发电厂的热力设备、热力系统、热经济性评价及优化运行与调整。
- XuetangX
- Self-Paced
- Free Online Course
设施园艺学


围绕生物、环境与工程交叉知识，学习温室环境调控与无土栽培，制定不同气候区域的园艺作物周年生产方案。
- XuetangX
- Self-Paced
- Free Online Course
工程制图


系统学习将三维空间形体表达为二维工程图样的方法，涵盖投影、尺寸公差、零件图与装配图的绘制和识读。
- XuetangX
- Self-Paced
- Free Online Course

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