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.

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。

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The historical experience and lessons show that peace is in the supreme common interest of mankind and we should never allow the historical tragedy to repeat.

历史的经验与教训表明，和平是人类最高的共同利益，绝不能让历史的悲剧重演。

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In her novels, she expressed a common western mood-fatalism, the tragedy of life, in her own way.

她以女性特有的敏锐笔触在其小说中反映了当时西方人的一种普遍的宿命论情绪，即人生的悲剧感。

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Tata was hopeful that the attacks would unite Indians behind a common goal of preventing a similar tragedy.

CNN: Taj Mahal hotel chairman: We had warning

Yet this tragedy of tragedies catalyzed a powerful connectedness between us, a depth of resilience and sense of common purpose that we must cherish.

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