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Telecommunications

Signals, SIM cards, roaming, data plans, bandwidth, modems, etc.

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Part 1

Part 2

Part 2

短信
通讯
频道
麦克风
拨打
网络
话筒
遥控

8 words to learn

Part 1

打电话
手机
接
传真
广播
挂
交换
信号
占线
电台

10 words to learn