聞所未聞

wénsuǒwèiwén

hear what one has never heard before; unheard-of

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wen2 suo3 wei4 wen2

unheard of, an extremely rare and unprecedented event

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聞所未聞|闻所未闻 [wén suǒ wèi wén] ► unheard of ► an extremely rare and unprecedented event