虚拟活动，是一种新型的人类活动。
在Advanced RealTime活动一节中更加详细地讨论了这些虚拟活动。
These virtual activities are discussed in greater detail in the Advanced RealTime activities section.
通过给玩家一个故事或者几个小测试，人们可以轻松的创建一个融合了物理和虚拟活动的游戏。
By giving the players a story and a number of quests, games can be built that involve a mix of physical and virtual activities.
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