flag byte

例句：

1. 1. The flag byte is a unique marker that distinguishes the data from other types of data.
   旗帜字节是一个独特的标记，用于区分数据与其他类型的数据。
2. 2.In some systems, the flag byte is used to indicate whether a message has been received or not.
   在某些系统中，旗帜字节用于指示消息是否已接收。
3. 3. The flag byte is also used in network protocols to ensure that data is transmitted correctly and securely.
   旗帜字节还用于网络协议中，以确保数据传输正确且安全。