The virtual property has three nature of the property which are utility, scarcity and availability. The virtual property is in legal owned by players.
它具有财产的三个属性：效用性、稀缺性、可支配性的，是属于玩家所有的一种具有价值的财产。
With the help of mathematical model, the paper employs the concept of external effect in economics and its relevant theory to explore the effects of foreign players on league utility.
引入经济学中外部效应的概念和理论，并借助于数学模型分析了外员使用对联赛效用的影响。
With the help of mathematical model, the paper employs the concept of external effect in economics and its relevant theory to explore the effects of foreign players on league utility.
引入经济学中外部效应的概念和理论，并借助于数学模型分析了外员使用对联赛效用的影响。
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