Lifespans ranged from three years for the mice, to 23 or more for common backyard squirrels.
动物寿命从3年到23年甚至更多。
The standard numbers are that lifespans have been growing at between one and two years per decade.
标准的数字是，寿命已经在每十年增长一至两年。
Waters prefers a physiological explanation for small dogs longer lifespans.
沃特斯倾向于从生理学方面解释小老鼠长寿的原因。
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