생물이나 사물이 살아 있거나 기능하는 기간.
The period during which an organism, object, or system is functional or alive, from creation or birth until death or failure.
예문:
"The average lifespan of a domestic cat is around 15 years, though some live much longer."
"Engineers designed the bridge with a projected lifespan of over 100 years, requiring minimal maintenance."
"Reducing stress and maintaining a healthy diet are key factors in extending human lifespan."