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Telecommunications
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使用 线
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不需领执照即可使用的无线电频谱
unlicensed wireless spectrum
不需领执照即可使用的无线电频谱
unlicensed radio spectrum
手机通话时使用扬声器或有线耳机,并使手机尽量与身体保持距离,能有效减少辐射
Using your cell phone's speaker or connecting a wired headset - while keeping the handset away from your body - drastically reduces radio frequency exposure
线路停止使用信号
line-out-of service signal
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