translation.en: So the old days before digital radio when you were tuning in your radio and you heard "crrcckkk" on the station you wanted to hear, that was the noise.
translation.zh: 所以以前还没有电子收音机的时候，如果调那种老式收音机 电台里面有时候有“喀喇喀喇”的声音 那个就是杂音