Dipyrrole
α, α'-联吡咯
🗣️ 情景例句
What does NATO stand for?
NATO代表什么？
The wise man's tongue is a shield, not a sword.
智者之言，是保卫而非攻击。
Yes, please. But why do you call them mooncakes?
行啊，请给我一个吧。但你们为什么叫它月饼？