【释义】
never having happened before, or never having happened so much
空前的，前所未有的:
【例句】
He took the unprecedented step of stating that the rumours were false.
他史无前例地声明谣言是子虚乌有的。
【例句】
Crime has increased on an unprecedented scale .
犯罪活动的增加规模空前。
【例句】
an event that is unprecedented in recent history
近代历史上没有先例的事件
