The average lifespan in some countries is under 50 .

某些国家人民的平均寿命不到50岁。

This can greatly increase the lifespan of your product .

这将在很大程度上延长你产品的寿命。

Encouraging medication compliance can lengthen a person 's lifespan .

鼓励服药依从性，可延长用药者的寿命。

That means a shorter , lifespan and heavier maintenance .

那意味着更短的使用寿命以及更加沉重的维修费用。

The correlation between paternal lifespan and children 's telomere length applied only to daughters .

父辈寿命长短与子女端粒长短之间的关系只适用于女儿。