As soon as the school bell rang, the hallway was filled with a cacophony of children's voices.

cacophony 由希腊语词根 kakos（坏的）和 phone（声音）组成，字面意思是"刺耳的声音"。这个词指"刺耳不和谐的声音组合"，常用来形容各种噪音混杂在一起的嘈杂状态。