October15，1970wasdeclaredInternationalWhiteCaneSafetyDa...
問題詳情：October15，1970wasdeclaredInternationalWhiteCaneSafetyDay（IWCSD）forthefirsttimebythePresidentoftheInternationalFederationoftheBlind（IFB）．ThisdatewasadoptedatthefirstconventionoftheIFB，heldinColomboonO...