n.先驱；前任；前兆；[生物]前体，前驱体
Her precursor as school principal was an eminent educator. 她任校长前是一位卓越的教育家。
Opposition by colonists to unfair taxation by the British was a precursor of the Revolution. 殖民地居民对英国不公正税收的反抗预示着革命的到来。
Lysine is a precursor of certain alkaloids. 赖氨酸是某些生物碱的前体。
前驱体
adj.先驱的；前兆的；作预备的
