She was part of the clinical trial that did this, and they gave everybody certificates after it was done.
她当时就在参与疫苗的临床试验,试验后他们会给每个参与者颁发一个证明
The clinical trial was designed such that almost two million elementary school children were given this test vaccine.
该临床试验的计划是,向近二百万的小学学生,接种这种测试疫苗
After the clinical trial it was rapidly introduced into the population.
临床试验结束后,该疫苗迅速地应用于大众
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