unprecedented

空前的；无前例的英释中释adjnever having happened before, or never having happened so much

1 unprecedented scale,史无前例的规模

1 He took the unprecedented step of stating that the rumours were false..他史无前例地声明那些谣言实属子虚乌有。

2 Crime has increased on an unprecedented scale..犯罪率增幅之大前所未有。