数据通信用户协会。
随着通信系统的迅猛发展，通信用户数量急剧增加。
Along with quick development of the correspondence system, the amount of consumer increased quickly.
随着通信系统的迅猛发展，通信用户数量急剧增加。
Along with quick development of the correspondence system, the amount of consumer increased quickly.
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