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
A journey of a thousand miles begins with a single step.
千里之行，始于足下。
After graduation, Mr. Jones immediately became a member of the United Nations Relief and Rehabilitation Administration.
毕业后琼斯先生就加入了联合国救济善后总署。
Although the bed was smashed to pieces, the man was miraculously unhurt.
尽管床摔成了碎片，但年轻人却奇迹地没有受伤。