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在我看来,自然界是最大的兴奋来源;最大的视觉美来源;最大的智力兴趣来源。它是生命中许多让生活有价值的东西的最大来源。
Sustainability isn't a trend—it's a responsibility we owe to future generations.
The spread of liberal democracy and the integration of the world economy have created a situation in which the major powers are no longer willing to risk war with one another.