lifespans
n.
（人或动物的）寿命( lifespan的名词复数 );
存在期;
使用期;
有效期;
例句:
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It may be that social prey mammals have longer lifespans than solitaries because of social support.
来自SA
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Their lifespans overlapped by six years.
他们在世的时间有6年是交叉的。
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Lifespans ranged from three years for the mice, to 23 or more for common backyard squirrels.
动物寿命从3年(老鼠)到23年甚至更多(普通的庭院松鼠).
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They've been called Shorts , due to their small stature but also their brief lifespans.
根据他们矮小的身材和短暂的生命周期,他们被称为“矮人”.
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Females only give birth once every two or three years, for a maximum of four or five offspring over their lifespans.
来自SA