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What do you think is the most serious social problem in China and why?
你认为是最严重的社会问题在中国，为什么？
The environmental problem is one of the most serious social problems that human beings are confronted with in history.
环境问题是人类有史以来面临的最严峻的社会问题之一。
Global warming may be the most serious global social problem threatening life on Earth.
全球暖化可能是最严重的全球性社会问题，威胁着地球上的生命。
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