加拿大政府将从辉瑞增购 2千万剂疫苗 http://www.kwcg.ca/bbs/article-227323-1.html (水城百事)
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that is right way.
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7000万还不够,20%的有效率,打三次才够
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if you think you are right, you math is not that right.
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总共9000万,一人3支,这样才能有效防护
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用数量来提高概率是个办法
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问题是副作用,辉瑞第一针副作用就不少。再多打一剂,会是什么后果?
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