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TOEFL BNC: 10361 COCA: 9664

something that happened or existed before another thing, especially if it either developed into it or had an influence on it先驱,先锋;先兆,前兆

Sulphur dioxide is the main precursor of acid rain.二氧化硫是形成酸雨最重要的先决条件。
Biological research has often been a precursor to medical breakthroughs.生物学研究往往是医学突破的先驱。
TOEFL BNC: 10361 COCA: 9664
TOEFL BNC: 10361 COCA: 9664
TOEFL BNC: 10361 COCA: 9664
precursor
Events that happen before other events: preface, prelude, precursor...
Before a time or event: before, first, early...

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