group code

例句：

1. 1.The company uses a group code system to ensure data security.
   该公司使用群组代码系统来确保数据安全。
2. 2. The group code is used to identify the participants in the conference.
   群组代码用于识别会议参与者。
3. 3.The group code was changed to prevent unauthorized access.
   群组代码被更改以阻止未经授权的访问。