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.
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.
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。
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