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According to the survey of WHO,there are more than 285 million people worldwide with visual impaired.For them,traveling alone is not so easy.What's worse,they are always living within their own narrow circle,so they hardly experience world culture.However,this braille ticket is so convenient that they go wherever they like all by themselves,thus bring great freshness and joy to their life.
Jinyi Chen; Feng Chen; Tuo Fang; Xi Wang