人类平均寿命在过去一个世纪稳步增长。

The average human ___lifespan has increased steadily in the last century.

一些电器产品寿命很短。

Some electrical goods have a short ___lifespan.

女性的平均寿命约为75岁，男性为69岁。

The average ___lifespan for women is about 75 years and for men 69.