1.  unprecedented
2.  all-time
3.  unparalleled
4.  unheard-of
5.  record-breaking

• 1. 空前的: unprecedented | unparalleled | all time | unheard-of
• 2. 以空前的速度: at an unprecedented rate
• 3. 空前的壮举: great feat

更多释义

• 1.这次使命已被宣布为一次空前的成功。
  The mission has been hailed as an unprecedented success.
  dict.yoduao.com
• 2.日元对美元的比价已跌至空前的低点。
  The yen has fallen to an all-time low against the dollar.
  dict.yoduao.com
• 3.他是一位空前的拳击好手。
  He was one of boxing's all-time greats.
  dict.yoduao.com

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