Our genes also help determine whether we look on the bright side, helping explain why some people have a spring in their step.

我们的基因也帮助决定我们是否看到光明的一面，帮助解释为什么有些人步履轻快。

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As a result, the reconstructed bug was able to reach exceptionally high concentrations in the lung tissue of mice tested, helping explain its virulence in humans.

结果，这个重建的病毒可以在实验小鼠的肺组织中达到格外高的浓度，这有助于解释它在人类中的毒性为何如此之强。

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As a result, the reconstructed bug was able to reach exceptionally high concentrations in the lung tissue of mice tested, helping explain its virulence in humans.

结果，这个重建的病毒可以在实验小鼠的肺组织中达到格外高的浓度，这有助于解释它在人类中的毒性为何如此之强。

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