形容詞 unprecedented:

1. having no precedent; novel

1. Science and technology have come to pervade every aspect of our lives and, as a result, society is changing at a speed which is quite unprecedented.
   科學和技術(shù)已經(jīng)開始滲透了我們生活的各個領(lǐng)域; 結(jié)果，社會正以空前的速度改變著。
2. We are seeing unemployment on an unprecedented scale.
   我們現(xiàn)在正經(jīng)歷規(guī)模空前的失業(yè)現(xiàn)象。
3. That is a situation unprecedented in the history of the school.
   這是該校有史以來未曾出現(xiàn)過的情況。
4. Some economists showed their anxiety on unprecedented level of unemployment.
   一些經(jīng)濟學家對失業(yè)率達到前所未有的程度表示憂慮。