Dioxopiperidine
二氧代哌啶, 哌啶二酮
🗣️ 情景例句
They are constantly quarreling.
他们时常吵架。
A thousand friends are few, one enemy is too many.
朋友千人尚觉少，仇敌一人犹嫌多。
She has been to school.
她上学去了。