Picolinamide
吡啶酰胺, 氮苯酰胺
🗣️ 情景例句
Nobody denies the convenience of living in town.
没有人会否认都市生活的便利。
I've bee invited over to a friend's, and you?
有个朋友请我去作客，你呢？
What size?
什么尺码的？