He sent a challenge to run a race.

他发出了赛跑比赛的挑战书。

youdao

I'm going to run a race.

我将要参加赛跑。

youdao

I accepted his challenge to run a race.

我接受了和他赛跑的挑战。

youdao

Less than two years later, Crist has left the Republican Party to run as an independent candidate in the race for a U.S.Senate seat in Florida, after realizing it was going to be impossible for him to win the Republican primary.

VOA: standard.2010.05.04

My husband, Paul, and I decided to run a race about two hours away from home.

FORBES: Personalization Goes Beyond the Name Game

All of them have pledged to run a race as a way to work through the tragedy.

CNN: Why we're running for Boston

That's why CNN iReport is asking runners and would-be runners to sign up to run a race -- maybe a marathon?

CNN: Why we're running for Boston