The survival of the human environment is facing unprecedented challenges.
人类的生存环境却面临着前所未有的挑战。
Today's children face unprecedented challenges from two very important areas.
今天的孩子们面临着前所未有的挑战，从两个非常重要的领域。
We meet today with unprecedented challenges, all of which are completely unknown.
我们今日遇到挑战前所未有，所有的情况完全陌生。
The value of librarians in the information age is under unprecedented challenges.
信息时代图书馆员的价值正在受到前所未有的挑战。
The international financial crisis has brought unprecedented difficulties and challenges to China.
国际金融危机给中国带来了前所未有的困难和挑战。
The international financial crisis has brought unprecedented difficulties and challenges to China.
国际金融危机给中国带来了前所未有的困难和挑战。
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