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美科学家说21世纪将是大热的世纪,一是二氧化碳剧增,这是化学的原因。二是地球气温升高,这是物理的原因。
The United States scientists say that the 21st century will be a hot century. The first is the sharp increase in carbon dioxide, which is the reason for chemistry. Second, the earth’s temperature rises, this is the physical reason.