The books are written to stimulate children's thinking and analytical skills. Each activity focuses on different learning skills-eye-hand coordination, letter recognition, matching etc.

这一系列书籍目的在于激发孩子的思维和分析能力。每项活动的重点不同，例如：手眼协调、配对等等不同的学习技能。

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Founded six years ago, LeapFrog grew out of Wood's effort to help his 3-year-old son, Matthew, with letter recognition.

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The owner was in the process of using a speech recognition system to dictate a letter to his girlfriend (no, nothing very steamy), and there at the bottom of the screen was his name (we'll call him Ralph).

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The recognition software is just too slow to recognize more than one letter at a time without producing a slew of predictive errors.

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