surveillance /sɚˈveɪləns/ noun Learner's definition of SURVEILLANCE
[noncount]
: the act of carefully watching someone or something especially in order to prevent or detect a crime监视 -
government surveillance of suspected terrorists政府对可疑恐怖分子的监视
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The bank robbery was recorded by surveillance video cameras.银行劫案被监控录像机拍了下来。
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electronic surveillance [=the act of using electronic devices to watch people or things]电子监控
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The police kept her under surveillance. [=watched her closely]警方在严密监视她。