前所未有

unprecedented

front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly

actually / place / classifier for houses, small buildings, institutions etc / that which / particle introducing a relative clause or passive / CL:個|个[ge4]

not yet / did not / have not / not / 8th earthly branch: 1-3 p.m., 6th solar month (7th July-6th August), year of the Sheep / ancient Chinese compass point: 210°

is not / has never been / never occurring / unprecedented

to have; there is / (bound form) having; with; -ful; -ed; -al (as in 有意[you3 yi4] intentional)