There are only five horses running in the first race.

只有五匹马参加第一场比赛。

《牛津词典》

"It's one of the horses running for the Derby," was the answer.

“是德比马赛中的一匹马，”他这样答道。

youdao

They saw five horses running out from the west side-door and stopped right in front of them.

只见镖局西侧门中冲出五骑马来，沿着马道冲到大门之前。

youdao

With 10 horses running in each race, it would seem that the odds of any one district running winning would be 1:10, or a 10% probability for the Wave to win.

FORBES: Bet On The Horse Or The Jockey?: Investing Lessons From An Italian Horse Race

In the Cajun match races, McNamara said owners who didn't use jockeys would hedge their bets by tying beer cans filled with rocks to the horses' manes to scare them into running harder or, in some cases, fastening on a live chicken.

WSJ: Kentucky Derby: Do Horse Races Really Need Jockeys?

In the past few weeks, horses from Mr Dartnall's stables were running at Wincanton, Exeter and Chepstow.

BBC: Victor Dartnall's horse virus outbreak 'a calamity'