[英][pri:'k?:s?z][美][pri:'k?:s?z]
n.先驅( precursor的名詞復數 ); 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.
雖然對地震前兆的研究已有多年，但至今仍沒有辦法能夠可靠的預計到未來地震發生的時間。
2.
Finally, phagocyte precursors may undergo malignant transformation, which results inacute or chronic myelogenous leukemia.
到最後，吞噬細胞前體可能發生惡變，導致急性或慢性骨髓性白血病。