n.前辈，前驱，先锋，前任；预兆，先兆，初期形式；[核]前驱波，初级粒子；预报器 变形： 复数：precursors 英英释义： precursor[ pri:'kə:sə, pri- ]n.a substance from which another substance is formed (especially by a metabolic reaction)a person who goes before or announces the coming of another同义词：forerunne