Ppf
[医][=pellagra preventive factor]抗糙皮病因子，维生素pp
🗣️ 情景例句
Smoking will kill you.
吸烟会害了你。
This man risks his life.
这个男人在冒着生命危险。
You can often buy things from their shop on your way home.
你可以经常在回家的路上到商店买你所需要的东西。