n.[C]

1. 先行者，先驱者；先导；前驱
   Penicillin was the forerunner of modern antibiotics.

   青霉素是现代抗生素的先导。

   Dr. Sun Yat-sen was the forerunner of Chinese revolution.

   孙中山先生是中国革命的先行者。

2. 先人，祖先
3. 预兆；征候
   Warm rains are the forerunners of spring.

   暖雨是春天来临的前兆。

n.

1. a precursor.
2. archaic an advance messenger.