1、冠军：champion
读音：英 [ˈtʃæmpiən] 美 [ˈtʃæmpiən]
释义：n. 冠军; 第一名; 优胜者; 斗争者; 捍卫者; 声援者; 拥护者;
v. 为…而斗争; 捍卫; 声援;
例句：
他们在过去的两年里一直保持着冠军地位。
They've held the championship for the past two years.
她保持了三年的世界冠军头衔。
She held the title of world champion for three years.
这位世界冠军昨晚三个回合就被轻松击败。
The world champion was humbled last night in three rounds.
2、亚军：
读音：英 [ˌrʌnər ˈʌp] 美 [ˌrʌnər ˈʌp]
释义：n.第二名;亚军;非冠军的获奖者
例句：
And finally, a word about the winner and runner-up.
最后，来谈一谈冠亚军。
She was runner-up in the regional little miss sunshine?
她在阳光小小姐的地区赛中得了亚军？
Were they just a runner-up in the game show" Happily Ever After"?
他们只是游戏秀“从此幸福”里面的亚军吗？
3、季军：third place
读音：英 [θɜːd pleɪs] 美 [θɜːrd pleɪs]
释义：第三场所;第三空间;第三名;第三地;季军
例句：
Britain has dropped from second to third place in the league.
英国在联赛中的排名从第二位降到了第三位。
I would challenge the, er, suggestion that we're in third place
我不太同意，呃，我们位居第三的说法。
Davies finished almost two seconds in arrears for third place.
戴维斯落后了差不多两秒，获得第三名。
参考资料来源：
亚军 second place
季军 third place
问题补充：那么多不一样的。。到底是哪个。。。。。。。。。。。。。。。。
我这个是查词典的本回答被提问者采纳
champion
Relative explainations:
championship
gold medal winner
kemp
title
titlist
Examples:
这位冠军为了下一场比赛正在进行训练。
The champion is in training for his next fight.
拥有世界冠军是我们每个公民的骄傲。
It's a civic pride to have a champion.
我上司让我给这位新网球冠军写篇小传。
My boss asked me to write a profile for the new tennis champion.
亚军 [yà jūn]
second place (in a sports contest) runner-up
Relative explainations:
silver medal winner
silver medallist
Examples:
赢得总统杯以后，球队满怀信心地迎接联赛的冠亚军决赛。
Having won the President Cup, the team got their tails up for the final of the league championship.
third place
季军
The Guangdong team won second runner-up.
广东队获季军
亚军 Silver 或者 Second place
季军 Bronze 或者 Third place
Gold medal 金牌
Silver medal 银牌
Bronze medal 铜牌
看比赛就知道英文记者最多常用 金银铜 这些来说明谁得了 冠亚季军
举例：马克刚为我们得了第一！ Mark just won us a Gold!
运动的话多用
Champion
First Runner-up
Second Runner-up
一般问答比赛的话用
First Prize
Second Prize
Third Prize