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。
The act or a period of observing; surveillance.
观察; 警戒观察或监视的行为或时间
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
