unprecedented rise绝后跌价;空前涨价英语;非正式罢工
unprecedented achievement前所未有的成就
unprecedented joy前所未有的喜悦
unprecedented times现在是空前的好时候
unprecedented move史无前例的举动
unprecedented project旷世工程
unprecedented time前所未有的时代
Unprecedented Visual前所未有视觉享受
Unprecedented Threat前所未有威胁
ADJ（形容词） If something is unprecedented, it has never happened before. 史无前例的
Such a move is rare, but not unprecedented.
这样的举动少见，但并非从来没有过。
ADJ（形容词） If you describe something as unprecedented, you are emphasizing that it is very great in quality, amount, or scale. (质量、数量或规模) 空前的[强调]
The mission has been hailed as an unprecedented success.
这次使命已被宣布为一次空前的成功。