层出不穷 céngchū-bùqióng more and more emerge

more and more emerge; innumerable succession; breeding like flies (idiom)

怎么记住“层出不穷”: 层 layer + 出 go out + 不 not + 穷 poor = more and more emerge.

汉字

Set idiom meaning things keep emerging one after another, endlessly - 新的骗局层出不穷 (xīn de piànjú céngchū-bùqióng) new scams keep cropping up nonstop.
Usually describes phenomena, problems, new products, or tricks appearing in an unstoppable stream; the flavor is often (not always) mildly negative or overwhelming.
Functions as a predicate at the end of a clause, not before a noun: say 类似事件层出不穷, not 层出不穷的… as a smooth attributive. Contrast 屡见不鲜 (lǚjiàn-bùxiān), which stresses 'so common it's no longer surprising' rather than 'endlessly new ones keep appearing.'