Nations prepare as World Health Organization raises the alert level.

国内为世卫组织提升警报级别做好准备。

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Currently the alert level stands at five out of six meaning a pandemic is imminent.

现在的警戒水平处于六个级别中的第五级，这意味着流行性疾病即将发生。

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The alert level "is now at a higher class" than in 2002, says Air Force Brig. Gen. Jung Jae-bu, commander of the 20th Fighter Wing.

“目前的警戒水平”高于2002年，第20战斗机飞行中队指挥官，空军准将郑在卜(音)表示。

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For the first time the W.H.O.raised its alert level from phase four to phase five on April twenty-ninth.

VOA: special.2009.05.06

because all we konw now it's orange alert, the alert level has gone up or gone down We don't really know what it goes on behind the scene.

我们都知道现在是橙色警报，警戒线时高时低,我们真的不知道,事情背后是如何处理的。

普林斯顿公开课 - 国际座谈会课程节选

World Health Organization Director-General Margaret Chan said the alert level was stepped up because influenza viruses are unpredictable and can spread quickly around the world.

VOA: standard.2009.04.29

Britain also updated its travel warning, though it did not raise its alert level.

BBC: Indonesia braces for tourism blow

There's no increased alert level for airports, and the general alert level remains at yellow.

NPR: New York, Los Angeles Step Up Security

Mexico raised the alert level for the Popocatepetl volcano near Mexico City after observing increased explosive activity.

WSJ: What's News