Picolinic acid
[建] 啶甲酸-[2]
🧩 词语组成解析
🗣️ 情景例句
How much notice of cancellation is necessary to get my deposit back?
想把定金拿回来，要提前多长时间通知你才行？
Which one is more economical?
哪一个是比较经济的？
Look! What does that boat look like?
瞧！那艘船看起来像什么呀？