999英语网 英语单词
Niacin的音标发音
Niacin
英式发音：['nasn] or ['nasn]
美式发音
(noun.) a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract.
乔治录入
(noun.) a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract.
乔治录入