As we know, English is w used around the world. But can all English speakers understand each other all the time? Of c not. （甚至）the same word can have many different meanings. Sometimes the meaning can change, depending on the country where it is （说）. For example, there are differences between British English and American English. Also, Australian English is a little different from British English. If you want to succeed in making y understood, you need to know some of these differences.
