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.
For example, you might pick up a travel book and read a few pages before going to sleep. It is enough to dip into it and read bits here and there. In a word, this is tasting.