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第一代模拟和第二代数字系统支持语音通信和有限的数据通信能力。
The 1st and 2nd generation wireless telecommunication system provide voice traffic and limited data traffic.
youdao
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第一代模拟和第二代数字系统支持语音通信和有限的数据通信能力。
The 1st and 2nd generation wireless telecommunication system provide voice traffic and limited data traffic.
youdao