frontager

例句：

1. 1. The frontager was the first to cross the finish line.
   这位前哨兵是第一个冲过终点线的。
2. 2. The vanguard of the revolution was a group of young men who fought for freedom.
   革命的先锋队是由一群年轻人组成的，他们为自由而战。
3. 3. The pioneers were the first to explore the uncharted territory.
   先驱者们是第一批探索未知领域的人。