life expectancy
(a) number of years that a person is likely to live, esp as statistically determined for insurance purposes 预期寿命(尤指人寿保险估计)
Women have a higher life expectancy than men. 女人比男人的预期寿命长.
(b) length of time sth is likely to exist or function (某事物的)预期存在的期限
the life expectancy of the average car, the present government 一般汽车使用的、 现政府执政的预期年限.