n.（人或动物的）寿命( lifespan的名词复数 )，存在期，使用期，有效期...

lifespans的音标：...

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).They've been called Shorts , due to their small stature but also their brief lifespans.根据他们矮小的...