...示信息的条码符号 54、二维条码（two-dimensional bar code）在二维方向上表示信息的条码符号 55、特种条码（special bar code）是特殊材料制成的条码 56、条码字符的值（character value）一维条码由条码逻辑式向字符集转换的中间值 57、码字（codeword）是二...
In addition, they depend on an array of specialty devices, such as audio book-readers, color readers, navigation tools, raised Braille labels, special bar-code scanners, and large-buttoned, voice-enabled MP3 players which are prohibitively expensive.