意大利面对我没有好处，但对她来说却很健康。
相反地，为什么家猫会变得肥胖和懒惰，而和它接近基因的野猫却很健康。
Conversely, why does the house cat grow obese and lethargic, while a bobcat with nearly identical genes stays fit?
她有一套理论，认为血统应该杂一些，而艾达呢，尽管土里土气，却很健康。
She had a theory one ought to cross breeds a bit, and Ada, though sub-urban, was healthy.
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