大多数移动运营商的收入超过80%都是来自于电话通话业务，与此同时，电话通话的价格“在一个以因特网为中心的世界里几乎都快接近免费。”

The majority of mobile operators depend on voice for over 80% of their revenues, and voice prices “are likely to fall close to zero in an internet-centric world,” he says.

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大气成分观测与分析中心现已建成上甸子区域大气本底站、城区环境监测站、移动监测等业务观测系统。

At present, an observation system have been founded, including a regional atmospheric background station (Shangdianzi), an urban environment monitoring station and a mobile monitoring station.

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移动业务交换中心-基站系统（MSC-BSS）接口；

Mobile-services Switching Centre - Base Station System (MSC - BSS) interface;

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移动业务交换中心-基站系统（MSC-BSS）接口；

Mobile-services Switching Centre - Base Station System (MSC - BSS) interface;

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