寿命 (shòumìng) means 'lifespan,' 'life expectancy,' or 'longevity.' It is used to describe how long a person, animal, or even a product is expected to last. The term 预期寿命 specifically means 'life expectancy.'
猫的平均寿命大约是十五年左右。
Māo de píngjūn shòumìng dàyuē shì shíwǔ nián zuǒyòu.
The average lifespan of a cat is about fifteen years.
健康的生活方式可以延长人的寿命。
Jiànkāng de shēnghuó fāngshì kěyǐ yáncháng rén de shòumìng.
A healthy lifestyle can extend a person's lifespan.
这种电池的寿命大概有两年。
Zhè zhǒng diànchí de shòumìng dàgài yǒu liǎng nián.
This type of battery has a lifespan of about two years.