美国服务器域名的构成：1、一个域名由两个以上的词段构成，而最右边的就是顶级域名，最通用的顶级域名是.com，.net和.org；2、靠左边的词段是二级域名，如在meilian.net中，meilian是二级域名。
具体内容如下：
1、顶级域名
一个域名由两个以上的词段构成，最右边的就是顶级域名。
现在国际上的顶级域名有：.com，.net，.org，.gov，.edu，.mil，.cc，.to，.tv以及国家或地区的代码等，其中最通用的是.com，.net和.org。
2、二级域名
靠左边的词段就是二级域名，例如在meilian.net中，.net就是顶级域名，meilian就是二级域名，meilian.net还可以有fuwuqi. meilian.net的形式，这里的fuwuqi则可以称为子域名。
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