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quantum leap

noun
🔊/ˌkwɒntəm ˈliːp/
🔊/ˌkwɑːntəm ˈliːp/
(also less frequent quantum jump)
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  1. 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，利润出现了巨大的飞跃。