先行者的英文：
forthgoer

Prominent leader in a cause, esp a political one
领导人;先行者;(尤指政治上的)旗手

The semitic peoples followed close upon these pioneers
紧跟在这些先行者之后的是闪米特人。

A forerunner or predecessor.
前人，先驱先行者或先驱

Dr. Sun Yat-sen was the forerunner of Chinese revolution.
孙中山先生是中国革命的先行者。

Vehicles yield to those with the right of way-particularly pedestrians.
车辆会让路给有权先行者——尤其是行人。