runner back

例句：

1. 1.He is a professional runner who has won many marathons.
   他是一个专业跑者，已经赢得了许多马拉松比赛。
2. 2.The runner-up finished second in the race.
   亚军在比赛中获得了第二名。
3. 3. The runner-up was awarded the third prize.
   亚军被授予了三等奖。