VLF communication

例句：

1. 1. VLF communication is a technique used to transmit signals over long distances without interference from other frequencies.
   低频通信是一种技术，用于在不受到其他频率干扰的情况下，远距离传输信号。
2. 2.In VLF communication, the signal is transmitted using very low frequencies that are not easily detected by humans.
   在低频通信中，信号使用非常低的频率进行传输，这些频率人类难以察觉。
3. 3. The VLF communication system was developed to improve communication between remote locations where traditional radio waves would not reach.
   低频通信系统被开发出来，以改善传统无线电波无法到达的偏远地区的通信。