If the universe has a positive curvature, it's a closed universe.
正曲率的宇宙是封闭的宇宙。
A closed universe is a finite universe — it will only expand to a certain size before collapsing.
封闭的空间是有限的，在膨胀到一定程度后就会崩缩。
In a closed universe, there is enough matter to reverse expansion. Eventually, such a universe will collapse on itself.
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。
The induced net minus energy of a closed universe equals the density rate of the second time change multiplying a constant.
闭合宇宙感应的净负能量与能量密度的两阶导数变化量成正比。
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。
Let's say we start in a universe that, at some particular moment, has no closed timelike curves.
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。
Indeed, closed timelike curves can make it impossible to de-fine "the universe at one moment in time."
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。
She must enter a new, unfamiliar, unfriendly, threatening, small universe, one formerly closed to her.
她必须进入一个新的、不熟悉的、不友好的、有威胁的、对他封闭的小圈子。
Never should a man stay in a closed-door room. You should explore the universe to see how men are coping with the events of changing times.
一个人永远不要固步自封，而要面对世界，去探索人们应如何应对世事变迁。
Never should a man stay in a closed-door room. You should explore the universe to see how men are coping with the events of changing times.
一个人永远不要固步自封，而要面对世界，去探索人们应如何应对世事变迁。
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