When the antenna receives a signal, the electromagnetic energy is converted from AC to DC.

当天线接收到信号时，电磁能量将从AC转换到DC。

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By using fewer sodium channels, the signal gets dimmed and energy is conserved.

减少钠离子通道可减弱信号，从而节约能量。

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When exposed to a radio signal, they use its energy to send back the information they contain, mostly a long number identifying an object.

当这些标签暴露在无线电信号下时，它们将利用信号的能量发回其所包含的信息，这些信息大部分是用于识别物品的一长串数字。

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These intensely bright but fleeting flashes of very high-energy radiation signal some of the Universe's most violent happenings.

BBC: Observatory detects record burst

We need a long-term cap on carbon output and a market price for carbon, he said, because it will send a long-term signal to energy companies, removing the uncertainty around capital investment plans.

FORBES: Energy Sec Chu Says Global Warming Is Real; Nat Gas Will Be Bridge Fuel