N-UNCOUNT (尤指司机使用的)民用波段，民用电台频道 CB, an abbreviation for (缩略 =) 'Citizens' Band', is a range of radio frequencies which the general public is allowed to use to send messages to each other. It is used especially by truck drivers and other drivers who use radio sets in their vehicles. (尤指司机使用的)民用波段，民用电台频道