Mankind is facing an unprecedented severe challenge.

人类正面临前所未有的严峻挑战。

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In the past year, the world economy has faced the severe challenge of the financial crisis.

过去一年，世界经历了国际金融危机的严峻挑战。

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Bird flue and other newly emerged epidemics represent a severe challenge for both China and ASEAN. China will propose to enhance bilateral cooperation in this area.

禽流感等新发传染病是当前中国与东盟共同面临的严峻挑战，中方将建议双方加强在此方面的合作。

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We have now only 19 people left (four vehicles) as two vehicles went back due to the severe challenge of the mission.

BBC: NEWS | Africa | Darfur aid worker's diary XVII

"The second quarter began as a severe challenge for United and the industry as a whole, but we saw a particularly positive trend as we moved through the period, " said Glenn Tilton, UAL's chairman, president and chief executive officer.

BBC: United Airlines trims losses

But if no agreement can be reached on how to enact such plans, the euro zone will face a "severe and fundamental challenge, " he added.

WSJ: Tony Blair: Euro is at a 'Final Decision Point'