a sudden, great and important change, improvement or development 突变;巨变;飞跃 This discovery marks a quantum leap forward in the fight against cancer. 这一发现标志着治疗癌症的一大突破。 There has been a quantum leap in profits since 2015. 自2015年以来,利润有了巨大的飞跃。
See also: quantum leap
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