retroactively
adverb/ˌretrəʊˈæktɪvli/
/ˌretrəʊˈæktɪvli/
(formal) (also more frequent retrospectively)
- from a particular date in the past rather than from the present date
有追溯效力的；溯及既往的 - The ruling should be applied retroactively.
这一裁决应该具有追溯效力。
- The ruling should be applied retroactively.