定义
polo: 马球，类似冰球，人坐在马上打球。
water polo: 水球运动，在泳池里打的团队球类运动，有一球两球门。
Despite both containing the word "polo", there is no real connection between polo and water polo. And there are no horses involved in water polo!
- "My horse has sprained his groin playing polo again!"
- "We can hit a few balls on the driving range or even play polo."
- "Xavier loved sports, particularly Water Polo, though he never understood how to get the horses in the swimming pool."
