今年早些时候，英特尔及西雅图华盛顿大学的研究人员演示表明，他们能够从4.1公里以外的电视信号中获取能量来给一个小功率传感器供电。

Earlier this year researchers at Intel and the University of Washington, in Seattle, showed that they could power a small sensor using a TV signal 4.1 kilometres away.

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通过将大功率(大电流)和小功率放大电路分置在不同的单元中，就可以避免输入信号受到干扰。

By putting the high-power (high current) and low power sections in different boxes we can help protect the input signals from harm.

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每个蜂巢装备有小功率的无线电发射器和接收器，使信号能在手机用户之间传播。

Each cell is equipped with a low-powered radio transmitter and receiver that permit propagation of signals among cell-phone users.

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