HSK 7-9
断断续续
duànduànxùxù形
intermittent; off and on; discontinuous; stop-go
雨断断续续下了整整一天。
Yǔ duàn duàn xù xù xià le zhěng zhěng yì tiān.
The rain fell intermittently for the entire day.
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Appears across levels (7-9) in the HSK 3.0 word list.