Antipellagra vitamin
[化] 抗糙皮病维生素; 维生素PP
🧩 词语组成解析
🗣️ 情景例句
I fold the fliers.
我摺传单。
Do not give a dog bread every time he wags his tail.
不要有求必应。
How many instruments do you play?
你能演奏多少种乐器？