Dinicotinic acid
[化] 烟碱二酸; 吡啶二甲酸
🧩 词语组成解析
🗣️ 情景例句
that will bring parents and teachers together once a week
让家长们及教师每星期一次
Are there any questions?
还有什么问题吗？
Are you a teacher?
你是教师吗？