Retroactivity
n. 追溯既往\\n[法] 溯及既往, 追溯效力
🗣️ 情景例句
Do you have any friends in the import or export field?
你有在进出口领域工作的朋友吗？
The fire is the test of gold;adversity of strong man.
烈火试真金，困苦炼壮士。
You're from Australia, aren't you?
你是澳大利亚人，对吗？