有许多有趣的冷门小知识，学习同时还能练英语。Did you know that Finland is the world's happiest country, according to the 2019 World Happiness Report?
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Library Genesis号称是帮助全人类知识无版权传播的计划。
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提供一个收集世界各地的数以百万计的图书数字化图书馆。
一款可谓是声名远扬的自学网站平台。Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
收集并分享数亿各行业实用文档和书刊杂志。
