Virtual currencies in mobile games are a huge driving force for popularity of apps, with 35 percent of the top 300 free games in the Apple app Store using in-app purchases as their monetization model.
手机游戏中的虚拟货币是其大众化的巨大推动力，苹果应用商店最受欢迎前300名免费游戏有35%正是以程序内购买作为其货币化模式。
By analyzing the characters of intelligent driving behavior, a more satisfying intelligent driving behavior model of virtual autonomous vehicle was developed.
通过对智能驾驶行为的特点分析，提出了一种更符合实际情况的虚拟自主汽车智能驾驶行为模型。
The effect of decentrations and teeth shape imperfections were examined by virtual prototyping model, which provided references to research on dynamic characteristics of gear driving device.
基于虚拟样机仿真研究了齿轮偏心、轴偏心、轮齿磨损等缺陷对啮合力的影响，为深入研究齿轮传动系统动态特性提供了理论参考依据。
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