当病毒攻击你的身体时，你的身体会努力摆脱它。

When a virus attacks your body, your body works hard to get rid of it.

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你也许会这样想，一个混合的免疫系统应当更加活跃而不是受抑制，所以它应当会攻击受捐献者的其他器官，因为其他器官在被移植的免疫细胞看来应当是外源的。

You would think that a chimeric immune system would be more active, not less, and would therefore attack the recipient's other organs, since they look foreign to the transplanted immune cells.

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小册子的解说颇有帮助，它说，如果一头熊过来攻击你，它可能是出于自卫的需要，你应该脸朝下躺在地上，保护好身体的关键部位。

If a bear comes over and gives you a good beating, it may just be feeling defensive, it explains helpfully. Lie face down and protect your vital organs.

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