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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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国际人道与可持续发展创新者计划2020年全球在线学堂项目全球在线启动开幕式暨研讨会


2020年6月30日HDI项目将进行全球在线启动，邀约多位相关国际知名专家共同探讨疫情应对与全球风险治理的可持续未来。
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心理统计


通过实验或调查数据收集、SPSS操作与报告撰写，学习心理学研究中统计方法的应用。
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普通化学


面向理科一年级学生的化学通识课，系统建立原子、分子、平衡、热力学与动力学基础，并联系生命、环境和材料科学应用。
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物理化学


物理化学是化学科学中的一门重要学科，是从研究化学和物理现象之间的相互联系入手，找出化学运动中最具普遍性规律的一门学科。是物理、化学、生物和环境专业必修的专业课程。
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环境地学原理


以地球环境系统及其各子系统的相互作用为主线，学习环境问题分析与环境地学调查方法。
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健康心理学


以生物—心理—社会模式连接健康行为、应激管理与慢性疾病干预，培养运用心理学促进身心健康的能力。
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结构化学


学习结构化学，打开认识物质微观结构与宏观性能关系的大门。
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定性研究方法


通过参与式学习掌握定性研究的设计、资料收集分析与结论形成，培养定性研究实践能力和研究思维。
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计算化学


计算化学课程在北京师范大学化学学院针对研究生已经开课达二十余年，目前为针对化学学院所有专业研究生的专业基础课，经过课程学习，研究生可以掌握基本的计算理论基础和程序使用方法。
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教师智慧教学新素养


面向教师的智慧教学课程，聚焦用数字化工具和教育数据改造课堂并实施精准教学。
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实验心理学


系统学习用实验方法研究心理现象，从实验设计、心理物理法到认知实验，培养开展实证研究的能力。
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恢复生态学


课程大量使用动画、视频、彩图、场景模拟、场景实拍等手段，结合生动细致的讲解，让学员掌握恢复生态学的最新原理、技术和方法。
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固体废物处置与资源化


系统讲解固体废物从收集、预处理到焚烧、堆肥、厌氧消化和填埋的处理处置与资源化技术。
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环境与可持续发展


系统认识环境问题及其与经济发展的关系，并学习水、大气和固体废物污染控制与可持续发展。
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从货币、银行与证券市场出发，理解资产配置、资本资产定价模型与有效市场假说，并结合中国金融案例认识投资本质。
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