Acetonide
丙酮化合物
🗣️ 情景例句
Thanks for your understanding and cooperation.
谢谢你的理解和合作。
A friend is never known till a man have need.
不到患难时，永远不能认识真正的朋友。
6 What would you like to be admired for?
6。你乐于被夸奖的事是什么？