That said, the electromagnetic frequencies used by Wi-Fi are also absorbed to some extent by things like walls, floors, and ceilings.

也就是说，Wi-Fi 使用的电磁频率也会在一定程度上被墙壁、地板和天花板等物体吸收。

Realizing that he could now wirelessly transmit signals using the electromagnetic frequencies of the planet, Tesla explored the practical applications, managing to light up 200 lamps fed by a power source situated 26 miles away.

特斯拉意识到自己现在可以利用地球的电磁频率无线传输信号，因此探索了实际应用，成功点亮了 26 英里外电源供电的 200 盏灯。