Today, our world faces the major global environmental challenge of a changing climate.

今天，我们的世界面临着气候变化这一重大全球环境挑战。

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Participants then watched movies of the faces slowly changing expression, from angry to happy, and were asked to find the photograph they had originally seen.

之后参与者观看一部电影，其中的面部的表情缓慢地由愤怒变为高兴，然后他们要从电影中找出一帧是最初看到的那一张照片。

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It faces complex challenges in managing its water in a changing environment.

该邦面临的一个复杂挑战是在变化多端的环境中管理其水资源。

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Mr.Orban adds that his government faces the task of "changing the constitution, saving the health care system, restoring public order and putting the economy back onto its feet."

VOA: standard.2010.05.29

The final challenge that Netsuite faces is changing the attitude of its prospective clients.

FORBES: The Bittersweet Challenges Of Being Netsuite

"Everyday people with an unusual appearance and other disfigurements suffer bullying, ridicule and hate crime, " said Changing Faces founder James Partridge.

BBC: Top Gear 'breached guidelines' on disability

However, the committee did note that charity Changing Faces, which helps people affected by conditions, marks or scars that alter their appearance, had drawn attention to the programme and asked their supporters to contact the BBC.

BBC: Top Gear 'breached guidelines' on disability