We detect the Drone primarily through radio frequency signals that are recognized by our sensors.

我们主要通过传感器识别的射频信号来探测无人机。

Wi-Fi is a wireless network that uses radio frequency signals to connect to the internet or send messages between devices, without wires.

Wi-Fi 是一种无线网络， 它使用射频信号连接到互联网或在设备之间发送消息， 而无需电线。

And so that's the superposition or the stacking up of all of these very low frequency gravitational wave signals from the cosmic merger history of supermassive black hole mergers.

它是所有这些超低频引力波信号的叠加或堆积，而它们来自宇宙超大质量黑洞累计合并。

To sleep, the chance to dream, but researchers at the Goethe University in Frankfurt say they can make those dreams more vivid by the application of low frequency electric signals.

睡觉时就有可能做梦，但德国法兰克福大学的研究者称通过导入弱频率的电信号就能让梦境更生动。