Study Design. A simple blind, random controlled clinical trial.
研究目的：单盲，随机对照临床试验。
A simple blind estimate algorithm is proposed based on matrix transform.
提出一种基于矩阵变换法的简便盲估计算法。
Ten years ago, the idea that the vision-impaired or even the blind might use the Web seemed ridiculous; today it is a simple reality.
年前，人们认为要让有视觉障碍的人(甚至盲人)使用Web是非常可笑的；但今天却实现了。
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