Sometimes they prevent firemen from doing their jobs.

VOA: special.2009.05.17

Maybe there are a number of structural problems that prevent them from doing that ... and they think, maybe, that-- I think Norway may be moving that way, so we'll see in the future.

也许在结构上存在不少问题,导致他们无法做到那一点,而且他们觉得，也许-,我认为挪威会向那个方向努力的，让我们拭目以待吧。

耶鲁公开课 - 金融市场课程节选

Otherwise,he says, there is no way to prevent them from doing this again to his children or his grandchildren.

VOA: standard.2009.09.07

None of these prevent parents from doing what they want to do with their children.

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And it certainly is not a robust enough deterrent to prevent others from doing the same.

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Just don't do what we're trying to prevent you from doing, and you won't have the problem.

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