shelf life
noun [ C usually singular ] uk/ˈʃelf ˌlaɪf/ us/ˈʃelf ˌlaɪf/ shelf lives
（尤指食品的）货架期，保质期
the length of time that a product, especially food, can be kept in a shop before it becomes too old to be sold or used
Fresh fruit has a very short shelf life. 新鲜水果的保质期很短。
可以使用（受欢迎或成功）的时限
the length of time that something remains useful, popular, or successful
These days many marriages have a fairly short shelf life (= don't last very long). 这个时代，许多婚姻都无法持久。