surveillance

名词 surveillance:

1. close observation of a person or group (usually by the police)

1. Detectives kept the quarry under surveillance for weeks.
   侦探们监测那个目标已有好几个星期了。
2. The act or a period of observing; surveillance.
   观察; 警戒观察或监视的行为或时间
3. The act of observing closely or the condition of being closely observed; surveillance.
   密切注视密切注视的行为或被密切注视的状态; 监视