I say, well, let's grade about five or six of them, maybe ten of them, get a sense of it.
我说,我们给它们中的5或6道题打分了,也可能是10道,大概了解一下。
Well, I talked about the problem of using plasmids in gene therapy, that it's very difficult to get them into cells.
我们之前讨论过,基因治疗中运用质粒的问题,质粒本身极难进入细胞
Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.
那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人
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