As much as I might talk on stage twice a week it turns out that it's really by doing and really by diving in and getting your hands dirty that you really take away the course's lessons.
我一周上两次课,就算说得再多,也不如你们亲自动手,通过真正的深入研究,才能学到知识。
I need one more piece of notation and then we can get back to having some fun.
我需要再引入一个符号,之后我们再继续研究
Though it's a great question, but I'm not going to try to pursue it any further.
尽管这个问题很值得研究,但我不打算再去深入地探讨它
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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