It is usually much better to prevent a problem from happening than it is to find ways to solve it.

VOA: special.2009.08.30

They have been working on improving their methods and they're trying to create divisions within their organizations that prevent the moral hazard from happening.

他们已经对技术进行改进,并且他们正尝试,在机构中划分部门,以便防范道德风险的发生

耶鲁公开课 - 金融市场课程节选

It wasn't caused by the Fed's sudden tightening against inflation. It was different it was this recession was not understood not anticipated; the Fed came in late to cut interest rates to try to prevent it from being worse because it just didn't seem to have any reason for happening.

它不是由于美联储对通货膨胀的,突然紧缩政策造成的，它不同之处在于,这个经济衰退没有被理解，没有事先准备好；,美联储试图阻止它恶化而,降低利率为时已晚，因为,它似乎看起来没有任何理由发生。

耶鲁公开课 - 金融市场课程节选

To prevent this from happening, levodopa can be combined with other substances, like carbidopa.

VOA: special.2009.04.07

Vaccination is a life or death question for poor people and if you can vaccinate a child to prevent a disease from happening it is a lot more cost effective than it is to treat that disease afterwards."

VOA: special.2010.03.29

Their goal: to find ways to fix the economic crisis and to prevent it from happening again.

VOA: standard.2009.03.31

"And I urge Congress to continue moving forward on financial reform that will help prevent the crisis we saw last fall from happening again."

VOA: standard.2009.10.22

Israeli analyst Ra'anan Gissin. "The strategic thinking has to be, first of all, to have sufficient intelligence but also the right intelligence, so that we can forestall, so that we can prevent this from happening right from the beginning."

VOA: standard.2010.07.12