那是一个封闭的宇宙。
请注意，在一个封闭的宇宙你可以朝着一个方向开始旅行，如果允许足够的时间，最终将返回到出发点；而在一个无限的宇宙中，你永远不会回来。
Note that in a closed universe you could start a journey off in one direction and, if allowed enough time, ultimately return to your starting point; in an infinite universe, you would never return.
在封闭的宇宙中，有足够的物质阻止宇宙膨胀，最终这样的宇宙就会崩缩。
In a closed universe, there is enough matter to reverse expansion. Eventually, such a universe will collapse on itself.
事实上，封闭的时间型曲线能让“在某个特定的时刻中的宇宙”不能自圆其说。
Indeed, closed timelike curves can make it impossible to de-fine "the universe at one moment in time."
正曲率的宇宙是封闭的宇宙。
If the universe has a positive curvature, it's a closed universe.
我们在宇宙中是以一些特定时刻来起始的，没有封闭的时间型曲线。
Let's say we start in a universe that, at some particular moment, has no closed timelike curves.
是不是这就意味着宇宙的形状就是平面、封闭球体或者马鞍状？
Does this mean space is shaped like a flat plane, a sphere or a saddle?
正如穆克吉写的那样，“这两种人的对话似乎只会发生在封闭和隔绝的宇宙中。”
As Mukherjee puts it, "The two conversations seemed to be occurring in sealed and separate universes."
我们已经说过，那只小鞋对于她就是整个宇宙，她的思想封闭在那只鞋里面，到死不会出来的了。
This little shoe was the universe to her, as we have already said. Her thought was shut up in it, and was destined never more to quit it except at death.
我们已经说过，那只小鞋对于她就是整个宇宙，她的思想封闭在那只鞋里面，到死不会出来的了。
This little shoe was the universe to her, as we have already said. Her thought was shut up in it, and was destined never more to quit it except at death.
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