So here we've got the continuing,evolving over time-- this is all taking place in France-- the personality of Napoleon in France.
所以这是持续的,随时间进化的…,这都是发生在法国-,法国拿破仑的人格。
And there's some space-time worm taking place in Michigan, some space-time person worm taking place in New York.
然后在密西根出现了某时空蠕虫,在纽约也出现了某时空蠕虫。
That's about taking time-in.
那就是关于花时间接受。
It's a more powerful method than something called a cross-sectional study, and I'll come back in a later lecture and talk about these in more detail, but a cross-sectional study means you're taking a snapshot of a population of people at one time.
这种方法比所谓的横断面研究更加有效,我将在以后的课中,再仔细讨论这个问题,但横断面研究是指,你一次记录下一群人的状况
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