surveillance

US /sɚˈveɪ.ləns/
UK /sɚˈveɪ.ləns/
"surveillance" picture
1.

监视, 监控

close observation, especially of a suspected spy or criminal

:
The police kept the suspect under constant surveillance.
警方对嫌疑人进行了持续的监视
CCTV cameras are used for public surveillance.
闭路电视摄像机用于公共监控