反复乐节的英文：
riff

Who let all of this riff-raff into the room?
是谁让那一大堆乱七八糟的人进来的？

Is it only the riff-raff who leave litter about in the parks?
只是那些下层社会的人才会在公园里乱丢东西吗？

There are always riff-raffs hanging around in Lao Zhang's home. Which gives you the feeling that Lao Zhang is not a good guy .
老张的家里总来些不三不四的人,可想而知老张不是什么好东西。