Ppf
[医][=pellagra preventive factor]抗糙皮病因子，维生素pp
🗣️ 情景例句
wants to appoint you to a special arts committee.
将任命你到一个特别艺术委员会。
Wash your mouth out with soap!
嘴巴放干净一点！
Where's that?
苏格兰在什么地方？