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The concept of touch knowledge is to help blind students learn better and not to let physical deficiencies become obstacles on their learning.Just almost is ok.this is the blind students most easily heard phrase,it is invisible to the students with normal students discrimination, therefore blind students will form a negative attitude.In order to use more convenient methods to get more accurate data.Touch knowledge adds a baffle to the edge of the ruler to help fix the measured object .This concept will help blind students learn better, build self-confidence and dispel negative learning attitudes.
Longyan City， Fujian Province, China