Now the intervention studies are stronger methods than the epidemiology studies but they're also more difficult studies to do.
相比传染病学研究,干预性研究更有效,但也更难执行
One are epidemiology studies and then the second are intervention studies.
一种是流行病学研究,另一种是干预性研究
Intervention studies are when you're actually doing something with people.
进行干预性研究时需要与实验对象有接触
That would be an example of an intervention study.
这就是干预性研究的一个例子
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