use-by date

People often stick with things that are well past their use-by date , stubbornly beavering away at goals that are no longer alive .

人们常常对已经过了保质期的东西不离不弃，一门心思朝着不再有意义的目标顽强奋斗。

So guys of a certain age who don 't want to look like they 've passed their " use-by " date are always running off at lunchtime to get their roots done .

因此那些上了岁数却不想让自己看起来“已经过景”的男人通常都会利用午休时间跑去补染发根。