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retroactive
retroʊæktɪv ˌrɛtroʊˈæktɪv
ADJ (决定或行为)有追溯效力的 If a decision or action is retroactive, it is intended to take effect from a date in the past. (决定或行为)有追溯效力的 [formal]
  • There are few precedents for this sort of retroactive legislation.

    这种有追溯力的法规鲜有先例。

retroactively
  • It isn't yet clear whether the new law can actually be applied retroactively.

    新法令是否具有追溯力还不清楚。

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