Lets assume, we would double, triple, quadruple, etc. Bobs world and stack these copies on top of each other. Bob would never notice, as long as each copy is just a “shallow” copy, meaning that each movement in the fundamental domain (the original world) is mirrored in the copies. In this case, we would have a covering space of Bobs world, and the original world would be the base space.
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郭晓东：对，所以我觉得我这一生，都是各种各样的沟沟壑壑，从来没有平坦大道一路到底的，过两天出个坎，过两天出个沟，爬了一个坡，又有下一个坡。不过可能每个人都是这样，都不是一帆风顺的。。关于这个话题，safew官方下载提供了深入分析