doorway monitor

例句：

1. 1. The security team is monitoring the doorway for any suspicious activity.
   安保团队正在监视门口，以防任何可疑活动。
2. 2. The homeowner installed a doorway monitor to deter burglars.
   房主安装了门廊监控摄像头，以阻止窃贼。
3. 3. The elderly lady was using her doorway monitor to check on her grandson's safety.
   这位年长的女士正在使用她的门廊监控器来检查她孙子的安全情况。