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.
人类正面临着一个严重的问题……，这个问题变的越来越严重。
Man is now facing a big problem……which is becoming more and more serious.
人类正面临着一个严重的问题……，这个问题变的越来越严重。
Man is now facing a big problem... which is becoming more and more serious.
环境问题是当今人类面临的全球性问题。
Environmental problem is a global problem in face of mankind nowadays.
水体富营养化是当今人类面临的重大环境问题。
Eutrophication is a severe environmental problem that human beings face.
人类的生存面临着严峻的问题。
There are serious problems for the survival of the human race.
生态危机是现代人类面临的“全球性问题”之一。
Ecological crisis is one of the global problems that human have to face.
人类正面临着一个严重的问题。
目前，人类面临着越来越严重的能源危机的问题。
At present, the humanity is facing more and more serious energy crisis's question.
但是，人类将面临更加严峻的气候问题。
环境问题是人类面临的重大问题之一。
Environmental issue is one of the major issues facing the whole world.
人类掌握概念的目的在于解决他所面临的新问题。
The purpose of which human grasps concept is to solve the problem he faces.
二十一世纪的人类，正面临着全球人口问题的挑战。
In the twenty first century. The human are facing the challenge of population problems.
人类正面临着一个严峻的问题……，这个问题变得越来越重大。
Man is now facing a big problem...... which is becoming more and more serious.
人类正面临着一个严重的问题？，这个问题变得越来越严重。
Man is now facing a big problem?, which is becoming more and more serious.
人类正面临着一个严重的问题……，这个问题变得越来越严重。
Man is now facing a big problem...... which is becoming more and more serious.
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.
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.
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