我和参议员奥巴马携手并肩，走出了历史性的一步，到达了这个国家的转折点。 我们终生都以建立一个更加完美的联盟为己任。
Together Senator Obama and I achieved milestones essential to our progress as a nation, part of our perpetual duty to form a more perfect union.
西伯利亚永久冻土的融化将释放大量甲烷，形成一种强效温室效应并进一步推动全球变暖，另一个转折点到了。
Another tipping point sees massive amounts of methane - a potent greenhouse gas - released by melting Siberian permafrost, further boosting global warming.
成功的人生如同登高，一步一步地拾级而上，这中间会有一个个关键的转折点。
Success in life is like climbing a height: It has to be done step by step. In the course of this there are certain crucial turning points.
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