"It's a huge support because then we can finally do intelligence, reconnaissance and surveillance right over the battlefields in real life, so we support the troops and we can support convoys driving around in real time."

VOA: standard.2010.07.27

This is the kind of surveillance that's needed to really make an impact and this is why-- one of the other ways where engineering approaches are needed in order to solve medical problems like this one.

这是一种必需,起到一定作用及,影响的监测观察,并且这就是,这也是在解决类似这种医学问题时,必须采取工程方法的原因

耶鲁公开课 - 生物医学工程探索课程节选

That's what surveillance does.

这就是监管机构的职责

耶鲁公开课 - 金融市场课程节选

They must have kept him under surveillance for a while." U.S.officials have been quoted as saying the operation Monday was launched when it became clear their target was traveling in an area away from heavy population.

VOA: standard.2009.09.15