surveillance /sə:ˈveiləns/ n. [u] 盯梢，监视：electronic surveillance电子监视；surveillance radar equipment监视雷达，警戒雷达(略作S.R.E)；air quality surveillance大气质量监视The police have been keeping her under surveillance.警察一直把她置于监视之下。Police maintained a 24-hour surveillance on the building.警方24小时监视这座建筑物。