Ppf
[医][=pellagra preventive factor]抗糙皮病因子，维生素pp
🗣️ 情景例句
John Marchetta runs this company. John Marchetta
经营这家公司。
Sweet discourse makes short days and nights.
言语投机恨时短。
That's the stupidest thing I've ever heard!
那是我听到的最愚蠢的事！