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For ordinary people, the key we carry too much may have some inconvenience,
but can be distinguished by the naked eye. However, for the blind,if carry too
much key,but the shape of the key just have little difference, it's difficult to go
through the touch to distinguish, "convenient for you" is a key box,on the surface
of the button that control key box has pattern and Braille, blind people can
independently complete the key storage, and in the process of operation,the
memory formation, improve operational efficiency.
Dalian Minzu University