To 循环 a 声音 is to 连续 repeat it 皮埃尔 舍费尔 used 循环 to draw the listener’s focus away from the 源 of the 声音 and towards the 节奏 and 质地（纹理、织体） 特征 within the 声音 itself

A 循环 is a segment of 声音 that repeats a 数 of times

Fact
The 术语 提出（起源） in the days when 声音 were 录制 onto 模拟 磁 磁带 作曲者 cut 作品 of 磁 磁带 and then joined them back to themselves in order to make a circle of 磁带 called a 循环 that went round and round Loops are used to 创作 反复 模式 of 声音