The batteries had a life span of six hours.

电池的使用寿命是6小时。

Most of the improvements in life span are the result of preventive, rather than treatment.

大多数寿命的延长是预防的结果，而不是治疗的结果。

Optimism's benefits for physical health also extend beyond heart health, such as improved immune system function and increased life span.

乐观对身体健康的益处不仅限于心脏健康，还包括改善免疫系统功能和延长寿命。

Typical Life Span is 5 to 8 years.

一般寿命5到8年。

I'll give you 20 years life span.

我给你20年的生命。