闻所未闻

wénsuǒwèiwén

闻所未闻 — wénsuǒwèiwén

1. unheard of; an extremely rare and unprecedented event

   这种技术的突破简直是闻所未闻，可能会改变整个行业。 zhèzhǒng jìshù de tūpò jiǎnzhí shì wénsuǒwèiwén kěnéng huì gǎibiàn zhěnggè hángyè — The breakthrough in this technology is simply unheard of; it could change the entire industry.