游戏种类有拼写，基础算术，时间表，代数。

Game categories include spelling, basic math, times tables, and algebra.

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可汉学院（Khan Academy） - 超过1200个视频教程，内容涵盖自基础算术、代数至微分方程、物理学、化学、生物学和金融学。

Over 1200 videos lessons covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance.

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那时候，小学主要注重基础教育，读读、写和算术。

Elementary schools at that time focused on basic education - reading, writing, arithmetic.

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And even six-month-olds are sensitive to these rudimentary facts of arithmetic, telling us something about their mathematical knowledge, but also telling us something about that they expect things to remain when they're out of sight.

即便六个月大的婴儿,对算术的基础知识已经相当敏感,向我们展示了婴儿所具有的数学知识,但也同时告诉了我们,婴儿在看不到物体时,仍然会认为物体依然存在

耶鲁公开课 - 心理学导论课程节选