Cycloaddition
n. [化]环加成( 指不饱和分子化合成一环状化合物的反应)
🗣️ 情景例句
How fast can my mail be received?
我的信件多快会被收到？
I really appreciate your help.
我非常感谢你的帮助。
I saw a beautiful fish in the street market the other day.
前几天，我在街市上见到一条很漂亮的鱼。