详细解释:a. 反动的, 追溯的, 有追溯效力的
【经】 有追溯效力的
词型变化：
名词:retroactivity副词:retroactively英语解释：
形容词 retroactive:
descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previouslyaffecting things past同义词：ex post facto, retro