跑步者

例句：

1. 1.She is a professional marathon runner.
   她是一名职业马拉松跑者。
2. 2. The runner crossed the finish line first.
   那位跑者首先冲过了终点线。
3. 3. He was a champion runner in his age group.
   他在他的年龄组是冠军跑者。