This appears to be the first time that a national campaign has made a buy in a video game, and is leading to some debate, as Obama often campaigns about th dangers of video games.

这说明这是历史上第一次在全国竞选中在电子游戏中来打竞选广告，并且这一事件导致了一些争论，就像奥巴马经常攻击电子游戏的危害。

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When he was about 11, he says, a police officer made several visits to his school to give warning of the dangers posed by illicit substances.

他告诉我们当他11岁左右时一位警官曾数次来到他所就读的学校来警告他们这种非法物质的危害。

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The accident made Three Mile Island synonymous with the dangers of nuclear power and helped slow expansion of the U.S. nuclear industry.

1979年，由于其装置被部分熔化而发生泄露事故，成了当时轰动全球的头条新闻，也使使三哩岛成了核能危险性的代名词，促使美国核工业减慢了建设的步伐。

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Two particularly high-profile quad bike accidents have made headlines and brought the dangers to wider public attention.

BBC: Welsh farmers' concerns over EU's quad bike changes

The coastguard on Holy Island has made a fresh plea to motorists about the dangers of the causeway's tides after three cars became stranded in 24 hours.

BBC: Car under water on Holy Island causeway

Furthermore, the fact that the federal government continued to expand under Bush -- both when Republicans and Democrats controlled Capitol Hill -- made it difficult to sell Republican arguments about the dangers of big government.

CNN: Commentary: Why GOP can't say 'whatever it is, we're against it'