lifetime
n
1 duration of sb's life or sth's existence （人的）一生; （事物的）存在期
a lifetime of service 使用年限
In your lifetime you must have seen many changes. 人的一生中一定目睹很多变革.
[attrib 作定语]
a lifetime subscription (to a magazine, etc) 长期订阅（某杂志等）.
2 (idm 习语) the chance, etc of a `lifetime an exceptional opportunity, etc 千载难逢的好机会等
Book now for the holiday of a lifetime! 为机会难再的假日现在立即预订!