My first attempts to transmit typhus to laboratory animals, including the smaller species of monkeys, had failed, as had those of my predecessors, for reasons which I can easily supply today.
我第一次尝试将斑疹伤寒传染给实验动物，包括较小种类的猴子，但和我的前辈一样失败了，原因我今天很容易就能解释清楚。
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