life expectancy
noun(also less frequent life expectation)
[uncountable, countable] (North American English also expectation of life [uncountable])
the number of years that a person is likely to live; the length of time that something is likely to exist or continue for 预期寿命；预计存在（或持续）的期限 Life expectancy for both men and women has improved greatly in the past 20 years. 在过去的20年里，男女的预期寿命都有了很大的提高。 Women have a longer life expectancy than men. 女人的预期寿命比男人长。 The life expectancy of a large bus is about 15 years. 一辆大客车的预期寿命是15年左右。 Japanese people have a very high life expectancy. 日本人的预期寿命非常长。