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大英儿童百科全书Britannica Discovery Library的认知系列（pdf+mp3）
Britannica Discovery Library-12-Just for Fun
Britannica Discovery Library-11-Time
Britannica Discovery Library-10-Numbers
Britannica Discovery Library-09-Words
Britannica Discovery Library-08-Sounds
Britannica Discovery Library-07-Shapes
Britannica Discovery Library-06-Colors
Britannica Discovery Library-05-Animals
Britannica Discovery Library-04-The World Around Us
Britannica Discovery Library-03-People and Places
Britannica Discovery Library-02-Me and You
Britannica Discovery Library-01-Me