PN code

例句：

1. 1. The PN code isused to transmit data over long distanceswithout the need for a physical medium.
   PN码用于在不需要物理介质的情况下，通过长距离传输数据。
2. 2. Incryptography, PNcodes are used to secure communicationchannels by scrambling the databefore transmission.
   在密码学中，PN码被用来在传输数据之前对数据进行加密，以保护通信通道。
3. 3.The PN code was designed to beeasily recognizable and easy toimplement in various applications.
   PN码被设计为易于识别且在各种应用中易于实现。