针对P 2 P系统中普遍存在的搭便车和公共悲剧问题，提出了一种基于博弈论的P 2 P服务质量激励机制。
According to the universal questions like free riding and tragedy of common in the P2P systems, propose incentive mechanism of P2P service quality based on the game theory.
我希望与美国人民一道在默哀过程中自省，并向在Tucson和Arizona两地公共悲剧中的无辜死难者致敬，包括那些仍为改善自身境况而奋斗的人民。
"I call on Americans to observe a moment of silence to honor the innocent victims of the senseless tragedy in Tucson, Arizona, including those still fighting for their lives," Mr.
哈萨克斯坦银行和乌克兰公共财政的悲剧就与那些管理完善，已经加入欧盟的富裕的小国没有什么关系。
The woes of Kazakh banks or of Ukraine’s public finances have little to do with the countries, mainly smaller, richer and better governed, that are already in the EU.
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