/ˌretroʊˈæktɪv/
retro·active
BrE /ˌretrəʊˈæktɪv/
NAmE /ˌretroʊˈæktɪv/
(formal)
= retrospective (2)
thinking about or connected with sth that happened in the past 回顾的；涉及以往的
(also less frequent, formal retro·active) (of a new law or decision 新的法律或决定) intended to take effect from a particular date in the past rather than from the present date 有追溯效力的；溯及既往的
retrospective legislation
有溯及力的法律
retrospective pay awards
有追溯效力的加薪
▸
retro·active·ly
BrE /ˌretrəʊˈæktɪvli/
NAmE /ˌretroʊˈæktɪvli/
The ruling should be applied retroactively.