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21世纪,人类面临着更加严峻的石油资源短缺问题。有科学家预测,地球上的石油资源如果按目前的消耗水平,仅可以维持60～100年的时间。
In the 21st century, mankind is facing a more serious shortage of oil resources. Some scientists predict that the petroleum resources on Earth will only last 60 to 100 years if they are at current consumption levels.