HSK 7-9
焕然一新
huànrán-yìxīnto look completely new (idiom); brand new; changed beyond recognition
重新粉刷后教室焕然一新。
Chóng xīn fěn shuā hòu jiào shì huàn rán yì xīn.
The classroom looked completely new after being repainted.
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Appears across levels (7-9) in the HSK 3.0 word list.