功能定位：本设计主要通过听觉补偿，把文字转化为语音信息，方便中老年人的阅读、学习；
Functions: the design mainly through compensation, taking the text into the voice message, to facilitate the elderly to read, study;
他失明后，他的听觉作为补偿比原先更灵敏了。
After he became blind his hearing has been keener in compensation.
我的听觉由于要补偿失去的视觉而变得更加敏锐。
I think that my ears are stronger to make up for my lack of sight.
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