Nicotimine
烟酰亚胺
🗣️ 情景例句
A whole day's work.
一整天的成果呀。
I can come any time except Sunday.
除星期天外我都能来。
I'm sorry I don't know. You'd better ask that policeman over there.
对不起，我不知道。你最好问问那边的警察。