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Explore free online courses from the world's top universities and companies. With these programs, you can build valuable skills, earn career credentials, and make progress toward a degree before you even enroll. Breakthrough pricing …

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Children in small classes are several months ahead in reading. 小班的孩子们提前几个月就开始阅读。 Unlike aerobics, walking entails no expensive fees for classes or clubs. 散步不像有氧健身操那样需要交纳昂贵的费用来参加健身班或俱乐部。 You have a choice of co-ed or single-sex swimming exercise classes. 可以选择男女兼收或是分班的游泳课。 Unchallenged wisdoms flow swiftly among the middle classes.

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Empower educators with instructional resources, professional development programs, and online training courses, available at no cost. Discover how institutions of all different sizes, demographics,...

Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. It’s all free for learners and teachers.

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