precursors
[英][pri:'k?:s?z][美][pri:'k?:s?z]
n.先驱( precursor的名词复数 ); 先行者; 先兆; 初期形式;
例句:
1.
Despite years of searching for earthquake precursors, there is currently no method toreliably predict the time of a future earthquake.
虽然对地震前兆的研究已有多年，但至今仍没有办法能够可靠的预计到未来地震发生的时间。
2.
Finally, phagocyte precursors may undergo malignant transformation, which results inacute or chronic myelogenous leukemia.
到最后，吞噬细胞前体可能发生恶变，导致急性或慢性骨髓性白血病。