If something runs in a loop, or is on a loop, it runs continuously, so that the same things are repeated again and again.

The tape ran in a continuous loop, repeating the same songs over and over. 这盘磁带处于循环播放状态，反反复复地播放那几首歌曲。

At one end of the room, the film clip was playing in a loop.

The music in the store was on a 40-minute loop.

Her 30 minute show runs on a loop all day.

A clip of his voice was put on a loop, with a percussion accompaniment.

See also: loop noun (REPEATED SECTION)