天线常常用来发射或接收无线电信号。

This antenna business doesn't sound secure - an antenna is used for sending or receiving radio signals.

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起先，他用来接收无线电信号的孔是在头皮的外部。

At first the sockets he was using to receive radio messages were outside the scalp.

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同样，与网站的每次交互都需要发送和接收无线电信号，需要消耗电池。请尽可能降低耗电。

Also, every interaction with your Web site requires sending and receiving radio signals, which drains batteries.

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