And then maybe ten minutes later I'll be like 'Oh,well, I need to talk to so-and-so,' and so then I'll go back on it, every thirty minutes or something."
VOA: special.2009.09.14
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
Now we'll go back further than 10,000 years to talk about the history of food, but in those--but at 10,000 years ago several very important changes happened that have shaped to a great extent what our modern relationship with food is.
让我们回到一万多年前,来讨论饮食史,但是,一万年前,发生了一些很重要的变化,这些变化很大程度上塑造了,现代人类与食物的关系
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