Citizens' Band
noun [ C or U ] trademark uk/ˌsɪt.ɪ.zənz ˈbænd/ us/ˌsɪt̬.ə.zənz ˈbænd/ (also Citizens' Band radio); (also CB)
民用波段，民用电台频带
a brand name for a radio communication system for members of the public
Long-distance truck drivers often use CB radio to talk to each other. 长途卡车司机常常用民用波段无线电相互交谈。