Niacytin
烟酸与糖的络合物
🗣️ 情景例句
About three weeks. We'll have enough time for our talks.
大约三个礼拜，我们有足够的时间交谈了。
What do you plan to do this Friday?
明天你打算干什么？
' But they don't realize one important thing.
”然而他们没有认识到重要的一点，