气候变化是全人类面临的重大挑战，需要国际社会合力应对。
Climate change is a grave challenge to mankind and calls for a concerted international response.
答：气候变化问题是全人类面临的重大挑战。
A: the issue of climate change is a major challenge facing the entire human race.
答气候变化问题是全人类面临的重大挑战。
The issue of climate change is a major challenge facing the entire human race.
人类进入高科技时代后仍然面临一系列挑战，应对这些挑战是我们时代的重大课题。
In the high-tech age, people face a series of challenges. How to meet these challenges is an important issue for us.
人脑、宇宙和生命被列为世界三大科学之谜，开展对脑科学的深入研究是人类21世纪面临的最重大的挑战之一。
Human brain, universe, and life are regarded as the three world enigmas in science. It is one of the great challenges for human beings to make further research of human brain in the 21st century.
人脑、宇宙和生命被列为世界三大科学之谜，开展对脑科学的深入研究是人类21世纪面临的最重大的挑战之一。
Human brain, universe, and life are regarded as the three world enigmas in science. It is one of the great challenges for human beings to make further research of human brain in the 21st century.
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