Ppf
[医][=pellagra preventive factor]抗糙皮病因子，维生素pp
🗣️ 情景例句
Well, I believe we can offer you 2,500 yuan a month at the start.
哦，我想我们可以给你每个月2500元的起薪。
Mr. Smith is a politician.He's running for election as governor.
史密斯先生是竞选州长的一名政治家。
'How's Tommy?' he asked.
“汤米怎么样？”他问。