HSK 7-9
翻天覆地
fāntiān-fùdìsky and the earth turning upside down (idiom); fig. complete confusion; everything turned on its head
小城十年间发生翻天覆地变化。
Xiǎo chéng shí nián jiān fā shēng fān tiān fù dì biàn huà.
The small city underwent sweeping changes over ten years.
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Appears across levels (7-9) in the HSK 3.0 word list.