coded scanning

例句：

1. 1. The security system uses a coded scanning to protect the premises.
   安全系统使用加密扫描来保护场所。
2. 2. During the night, they used coded scanning to avoid detection.
   在夜间，他们使用加密扫描以避免被探测。
3. 3. The police department is using coded scanning to track down the thief.
   警察局正在使用加密扫描追踪小偷。