Definition: when a city, government, leader, etc. loses power or control Level: C1
罗马帝国的灭亡是历史上的一个关键时刻。
The ___fall of the Roman Empire was a pivotal moment in history.
在旧系统垮台后，社会经历了快速变革。
After the ___fall of the previous system, society underwent rapid transformation.
专制政权的意外垮台引发了广泛的庆祝。
The unexpected ___fall of the authoritarian regime sparked widespread celebration.
