Dioxopiperidine
二氧代哌啶, 哌啶二酮
🗣️ 情景例句
He's got 20/20 vision.
他的视力很正常。
What's goes on here?
什么事？
Oh! They're all places of great interest in China. I think you'll have a good time.
噢！这些地方都是中国的名胜。我想你们会玩得很痛快的。