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Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder

Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

新概念英语 New Concept English 听力与课文播放器，支持课本选择、课程列表、逐句播放与中英对照。