HSK 7-9
层出不穷
céngchū-bùqióngmore and more emerge; innumerable succession; breeding like flies (idiom)
新的网络骗局层出不穷。
Xīn de wǎng luò piàn jú céng chū bù qióng.
New online scams keep emerging one after another.
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Appears across levels (7-9) in the HSK 3.0 word list.