各国都有自己的国民体育项目，如今，一些流行的体育项目传至世界各地。然而，大多数国家也会有人进行一些非常规的体育项目，这些项目的规则或奇怪或有趣。
Every country has a national sport and some popular sports are now played across the world. However, in most countries, people also play unusual sports, with strange or interesting rules.
然而从这种奇怪的交易规则中受益的一些小商店主和商人将会投反对票。
But there will be opposition, led by the small shops and businesses that benefit from the weirdest trading laws.
本书配套练习册上这一章的练习3b会带着你一步步了解麻瓜的几何规则如何作用，他们又是怎样达到那种奇怪的思想状况。
Exercise 3b in the associated workbook of this chapter will take you step by step through how Muggle Geometrics work to show you how they get to that peculiar state of mind.
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