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I was less successful in my attempts to effect preventive vaccination against typhus by using the virus and in trying to produce large quantities of serum using large animals.
我曾尝试用这种病毒来预防接种斑疹伤寒,并试图用大型动物生产大量血清,但都没有成功。
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16 种意境 · 9:16 竖屏 · 1440 × 2560 高清图片