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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That's what surveillance does.

这就是监管机构的职责

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