HSK 7-9
前所未有
qiánsuǒwèiyǒu(idiom) unprecedented
城市面临前所未有的挑战。
Chéngshì miànlín qiánsuǒwèiyǒu de tiǎozhàn.
The city faces unprecedented challenges.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.