| 单词 | quantum leap | 
| 释义 | quantum leapnoun   plural quantum leaps     : an abrupt change, sudden increase, or dramatic advance  Note: Quantum leap is rarely used in scientific contexts, but it originated as a synonym of quantum jump, which describes an abrupt transition (as of an electron, an atom, or a molecule) from one discrete energy state to another. quantum leap nounas in breakthrougha sudden large change or improvement Prices have taken a quantum leap upward. The new drug is a quantum leap in the fight against cancer. Synonyms & Similar Words Relevance 
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