Antipellagra vitamin
[化] 抗糙皮病维生素; 维生素PP
🧩 词语组成解析
🗣️ 情景例句
I should thank you for encouraging me
我应该感谢你一直鼓励我
How often did I tell you not to yell in the house?
我告诉你多少次不要在房子里大叫?
The sudden barking frightened Clara.
突然的狗叫声吓坏了克拉拉。