campaign
a series of planned activities that are intended to achieve a particular social, commerical or political aim
指为社会、商业或政治目的而进行的一系列有计划的活动或运动
the campaign for parlimentary reform 要求议会改革的运动
an advertising campaign 广告宣传活动
sport
activity that you do for pleasure and that needs physical effort of skill, usually done in a special area and according to fixed rules
体育活动
the use of drugs in sport 禁药在体育运动中的使用
game
1. an activity or a sport with rules in which people or teams compete against each other
有规则的游戏、运动、比赛项目
card games 纸牌游戏
board games 棋类游戏
ball games, such as football or tennis
2. an occasion of playing a game 一项游戏、运动、比赛
to play a game of chess
Saturday's League game against Swansea 联赛中星期六对斯旺西队的比赛
Let's have a game of table tennis, 咱们来打场乒乓球赛吧
3. sb's game (the way in which sb plays a game)
比赛（或游戏）时用地手法；比赛（或游戏）技巧
Hendry raised his game to collect the first prize. 亨得利的比赛技巧有所提高，得到了头等奖
Stretching exercises can help you avoid injury and improve your game. 伸展运动有助于防止身体受伤，并能提高比赛技巧。
4. a section of some games, such as tennis, which forms a unit in scoring
（网球比赛的）一场，一局
5. 儿童游戏
a game of cops and robbers 警察抓强盗的游戏
6. 消遣，娱乐
He was playing games with the dog.
7. 活动，行业
How long have you been in this game? 你干这行多久了？
8. a secret and clever plan; a trick
诡计；策略；花招
So that's his game (=now I know what he has been planning). 原来这就是他得鬼把戏
以上所有资料来自牛津高阶英汉双解词典第七版
希望这些对您有帮助！！