Scientists are increasingly keen to find out what's going on because they consider the Arctic the "canary in the mine" for global warming—a warning of what's in store for the rest of the world.

科学家们越来越想知道到底发生了什么，因为他们认为北极是全球变暖中“煤矿中的金丝雀”——是对世界其他地方即将发生的事情的警告。

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Both programs will start 1 day later if there is a warning of rainstorms.

如果有暴雨警告，这两个项目都将推迟一天开始。

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The displays of art museums serve as a warning of what critical practices can emerge when spontaneous criticism is suppressed.

艺术博物馆的展览提醒我们，当自发的批评被压制时会有什么样的批评行为出现。

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The saying becomes a warning about the dangers of attacking people who are in more important positions than you are.

VOA: special.2010.01.17

OK, to work. A word of warning: fasten your seat belts.

好了，开始工作，一些警告的话：,系紧你们的安全带。

麻省理工公开课 - 计算机科学及编程导论课程节选

That created a big constituency in favor of a dumb change. There was little warning.

这造就了一种悄无声息的变化,没有人提出警告。

斯坦福公开课 - 经济学课程节选

Meanwhile, Mumbai's police chief said Tuesday that he never received a warning of an impending seaborne attack on his city.

CNN: Rice heads to India to ease tensions

Chevron ( CVX) also fell 1% in the pre-market after issuing a warning of weakness in its downstream business last night.

FORBES: Retail Sales And Jobless Claims Underwhelm But Stocks Stay Positive

It was simply safer, from the point of view of survival, to hear rustling in the grass as a warning of danger.

WSJ: May 21 and the Enduring Appeal of the Apocalypse