Diazidoethane
二叠氮基乙烷
🗣️ 情景例句
Did you pay for that?
你付钱了没有？
Politeness is to do and say the kindest thing in the kindest way.
文雅就是善良地做事，和善地说话。
These were the so-called mainframe machines.
它们被称为主机。