Retroactivity
n. 追溯既往\\n[法] 溯及既往, 追溯效力
🗣️ 情景例句
Do have some more, there's plenty left.
多吃一点，还有很多呢！
Walk groundly; talk profoundly; drink roundly; sleep soundly.
行路踏实，言谈深刻，饮酒豪爽，睡眠酣畅。
They carved a whole page of characters back-to-front in the wood.
他们在木板上刻满整页的反字（背面朝上）。