来自世界各地的退伍军人显然又是一个空前挑战。
Veterans from around the world had surmounted one more unprecedented challenge.
自从经济危机爆发，世界仍然受到来自气候变化和极度贫困的空前挑战。
Emerging from recession, the world remains challenged by unprecedented climate change and by grinding poverty.
加入WTO后，直面国外同行的强大实力，国内电信设备制造商将遇到空前挑战。
After entering into WTO, domestic telecom equipment manufacturers will meet unprecedented challenges from powerful foreign competitors.
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