Australia and the United States have more in common with each other than either one has with most of the rest of the world为什么用either

问题描述:

Australia and the United States have more in common with each other than either one has with most of the rest of the world
为什么用either

澳洲或美国其中任何一个。。。。

either 是两者间任何一个的意思.(因为句子是说美国与澳洲两个国家.)