To hem in(a competitor) in a race.
比赛时包围（与赛者）
a contestant that you are matched against.
与你进行比赛的竞争者。
make the same score as(another competitor)
与（另一参赛者）得分相同
Our sponsors kindly request you to wear our special runners' vest during the race
敬希各参赛者穿着大会派发的T-恤参与赛事。
A contest or tournament involving participants from all parts of a nation.
全国性比赛包括来自全国的参与者的竞赛或联赛
After Bill lost the race, he swallowed his pride and shook hands with the winner.
比尔比赛失败后，认输并与获胜者握手。
Defending the History:W.H. Donald's Memoir and the American Journalist E. A. Selle
捍卫历史:端纳回忆录与美国记者赛尔
One who competes against the holder of a title or championship, as in boxing.
夺标者如在拳击赛中与优胜者或冠军对抗的人，
Of or relating to one of four competitions in a tournament, whose winners go on to play in semifinal competitions.
四分之一决赛的在一次锦标赛中四场比赛之一的，或与之有关的，其获胜者可继续进入半决赛
The Referee and Judges of a kumite bout must not have the nationality of either of the participants.
对打回合赛的主审和副审或与参赛者不可有相同国籍。
Runners train for races.
赛跑者为比赛而锻炼。
a television or radio program in which contestants compete for awards.
参与者为了奖品而比赛的电视或广播节目。
Each participant vied with somebody else in a test of reaction time.
每一位受试者都与另一位竞赛反应的时间。
athletes will compete against each other according to the knockout system.
即以淘汰制筛选胜者，运动员将与对手比赛。
It is a great pleasure for me to attend this English Speech Contest Final this afternoon. Congratulations to all the devoted participants and winners.
我非常高兴参加今天下午的英语演讲比赛决赛。我向所有积极参与者和获奖者表示热烈的祝贺。
(of a contest or contestants) evenly matched.
（指竞赛或者竞赛者）同等、相称。
One who participates in contests simply to win prizes.
逐奖参赛者单纯为获奖而参加比赛者
Angus: Yes! The Sunshine Singers are in the contest! Well be competing against nice other contestants.
安格斯：耶！阳光歌唱队进入决赛！我们将与其它有水准的参赛者决一雌雄。