P code

例句：

1. 1. The P code was used toencrypt messages during World War II.
   二战期间，P码被用来加密信息。
2. 2. Theresearchers have developed a new P code fortransmitting data over long distances.
   研究人员已经开发了一种新密码，用于在长距离上传输数据。
3. 3. The P code isstill widely used in military communications today.
   今天，P码仍然广泛用于军事通信。