Ppf
[医][=pellagra preventive factor]抗糙皮病因子，维生素pp
🗣️ 情景例句
Oh, who could that be?
啊，这会是谁呢？
Fire that's closest kept burns most of all.
关得最紧的火，燃烧得最炽烈。
Now I could see a smaller deer next to the one my brother had pointed to.
现在我可以看见一只更小的鹿，它紧挨着我弟弟指的那一只。