You have to test it by giving the vaccine to a large population of people, and then watching and seeing if you've reduced the incidence of the disease.
这样的测试的做法只能是,给大量人群分发疫苗,接着观察和了解,这种疾病的发病率是否有所降低
You have to test it by giving the vaccine to a large population of people, and then watching and seeing if you've reduced the incidence of the disease.
这样的测试的做法只能是,给大量人群分发疫苗,接着观察和了解,这种疾病的发病率是否有所降低
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