• "The world has been a very violent place in oil frontier places when we have had enough to go round.

    VOA: standard.2009.10.20

  • I think that these countries are somewhat trying to manage this oil risk but they can't yet get onto the frontier.

    我想这些国家或多或少,都试着控制石油风险,但他们根本无法达到有效边界。

    耶鲁公开课 - 金融市场课程节选

  • Where are we on this frontier regarding oil in the United States?

    考虑到美国拥有的石油的话我们又在哪呢?

    耶鲁公开课 - 金融市场课程节选

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