Dioxadiazole
二恶二唑
🗣️ 情景例句
Come on.
来吧。
This is not an occasion for laguhter.
现在不是该笑的时候。
I don't have any small pads. I only have large one. Do you want a pad?
我没有小本的信纸，只有大本的。您要一本吗？