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
saying he was going to the railroad station
说他要去火车站
He knows best what good is that has endured evil.
忍过痛受过苦，最知幸福是何物。
His previous attempts had been unsuccessful.
他以前的尝试没有成功。