个体的跨界同一性分析是可能世界理论的重要内容之一。
Analysis of identity of transworlds individual is an important content of the theory of possible words.
在爱因斯坦的时代，全世界只有几千名物理学家，那些在智力上能与爱因斯坦匹敌的理论家，可能一辆有轨电车就都坐下了。
In Einstein's day, there were only a few thousand physicists worldwide, and the theoreticians who could intellectually rival Einstein probably would fit into a streetcar with seats to spare.
它是怎样产生的：有很多关于人类文明是怎样的理论——就我们所知道的世界可能已经结束。
How it could happen: There are any number of theories for how human civilization — the world as we know it — might end.
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