1N-VAR [oft with poss](人、动植物的)寿命,预期生命期限 The lifespan of a person, animal, or plant is the period of time for which they live or are normally expected to live. (人、动植物的)寿命,预期生命期限
A 15-year lifespan is not uncommon for a dog.
15年的寿命对狗而言是比较常见的。
They have extended the potential life span of humanity everywhere.
世界各地人类的预期寿命均有所延长。
2N-COUNT [oft with poss](产品等的)预期使用期限;(组织、想法等的)预期存在期限 The lifespan of a product, organization, or idea is the period of time for which it is expected to work properly or to last. (产品等的)预期使用期限;(组织、想法等的)预期存在期限
Most boilers have a lifespan of 15 to 20 years. [+ of]