| 1. | A monthly cell - phone service bill , for instance , contains charges for leasing radio spectrum , renting cell towers and purchasing the handset , as well as the amortization of the hardware at the cell base site , the cost of interconnections among cell sites , billing expenses and network operator profit
举例来说，行动电话的月租费通常包含使用无线电频谱、租用基地台和购买手机，以及摊提行动电话基地台硬体、基地台之间的连接费用、计费成本和网路系统业者的利润等。 |
