Retroactivity
n. 追溯既往\\n[法] 溯及既往, 追溯效力
🗣️ 情景例句
Hi, Pop. Hi, Son.
你好， 爸。你好 ，儿子。
Your English is very good.
你的英语很好。
And I advise you not to eat fruit that isn't ripe in future.
还有，我劝你今后不要吃不熟的水果。