| 释义 |
lifespan
['laɪf.spæn] noun countable
■the length of time for which a person, animal or thing exists 寿命；可持续年限，有效期•The average human lifespan in the developed countries has increased over the last hundred years.发达国家的人均寿命在过去的100年间延长了。 •The project's lifespan is estimated at about five years.预计这项工程为期五年左右。 |