That, Lardy at the Peterson Institute said, gives the country unusual power.

皮尔森研究所的拉迪说，该国拥有不同寻常的力量。

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However, the buy-out group had previously said that Mr Peterson, 80, would retire at the end of 2008 and would be allowed to sell his stake in the listed vehicle immediately.

不过，这家收购集团此前曾表示，80岁高龄的皮特森将于2008年底退休，届时他可以立刻售出其在该公司的股权。

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Every new method of protection system "often appears to be a silver bullet," Peterson said.

每一种防卫系统的新方法“往往看上去是一颗银弹，”Peterson说。

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"It's really tough, " said Peterson, a hospital registration clerk who contacted CNN through iReport.com.

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While in quarantine, some of the students had roommates, others did not, said Peterson, who told CNN she got information from the teacher chaperones.

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This type of impact by top-of-the-food-chain predators on lower trophic levels is well known in marine systems, said Peterson, and has been shown to occur in terrestrial systems in the study of invertebrates.

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