If you cannot know whether you are in the real world or in the word of a computer simulation, you cannot be sure that your beliefs about the world are true.

如果你无法知道自己是身处现实世界还是受困于电脑模拟情境，那么你就不能确定自己对于世界的信仰是正确的。

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A persistent world is a simulation that keeps running whether players are logged in or not.

永恒的世界是一种无论是否有玩家登录，都一直保持运行的模拟环境。

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I spent three years writing this story, during which time I passed its hypothetical world through myself as a simulation. The chaos is still there - in full measure.

我花费了3年时间来写这个故事，我通过模拟一个假想的世界来度过那段时间，而混乱始终在那里——全副武装地。

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The enjoyable "real world" simulation builds on The Sims series, which sold more than 150 million copies worldwide.

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Two years into the round, as trade ministers gathered for a summit in Mexico, the World Bank was pushing another extravagant simulation.

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Two other real-world, professional demos include a 3D training and simulation app that trains welders, and a practice and assessment application, created by a facial reconstruction doctor, which uses the 3D app to prepare for highly complex, intricate surgeries he plans to perform.

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