The first generation of mobile communication systems (1g) was analog cellular system for mobile communication standard with the main voice services.
第一代移动通信系统(1g)是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The first generation of mobile communication systems (1g) was analog cellular system for mobile communication standard with the main voice services.
第一代移动通信系统(1g)是模拟制式的蜂窝移动通信系统，主要提供话音服务。
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