心脏对剧烈运动反应良好。
而在没有响尾蛇分布的阿拉斯加，同一品种的松鼠对毒液的反应要剧烈的多，他们的血清中和毒素的能力也大大弱于加利福尼亚的。
But squirrels of the same species from Alaska, where the rattlesnakes are absent, exhibit much greater sensitivity to the venom, and their serum is much less effective at neutralizing the venom.
该病对寒冷有很剧烈的反应，十个人中只有一个人会患上冻疮，但是如果在冬天的夜晚站在烤肉队伍里的话，患上冻疮的几率会大大地提高。
An extreme reaction to cold, chilblains affects one in 10 people but your chances of getting them will be upped considerably by standing in kebab queues on winter nights.
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