Dr.Redd says one of the things health officials learned is that the global surveillance system needs to be even more comprehensive.

VOA: standard.2010.04.29

We now know what happened because of the surveillance investigation.

我们现在知道发生了些什么,经过监督调查后

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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

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"We will just exercise a level of surveillance that will clearly ensure that nothing like this happens again,"

VOA: standard.2010.01.23

That's what surveillance does.

这就是监管机构的职责

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North Korea is warning the United States not to send surveillance planes too close to the site of a planned long-range rocket launch.

VOA: standard.2009.04.01

To counter that threat, the U.S.military will deploy Aegis ships equipped with missile interceptors along with radar surveillance sensors to counter the Iranian threat.

VOA: standard.2009.09.17

And police have purchased additional crowd control equipment, including six helicopters, and 300 mobile surveillance cameras.

VOA: standard.2009.06.12

The powered parachute can fly very low to the ground, and as slowly as giving officers a clear view during search and surveillance operations.

VOA: standard.2010.01.01

"We also put additional surveillance units on at any public gathering that was substantial."

VOA: standard.2010.05.14

But that is only helpful in surveillance or a post-incident investigation.

VOA: standard.2010.04.01

"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

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

The national reports clearly, from 20 countries out of the 21 countries in the region, Iraq was the only country that could not report, for understandable reasons - all 20 countries have shown that they have weak programs, weak surveillance, and that the coverage is very,very poor.

VOA: standard.2010.07.07