never having happened or existed before 前所未有的;史无前例的 The government took the unprecedented step of releasing confidential correspondence. 政府迈出史无前例的一步,公开了机密信件。
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New: new, latest, novel... -
a.
the greatest in size, amount, degree etc that has ever been known (大小、数量、程度等)前所未知的,空前的 The flood waters have risen to unprecedented levels. 洪水已升至历史最高水位。
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