在颠倒的域名之后，需要使用单一单词的子包名。
After the reversed domain name, use only single-word subpackage names.
大部分搜索引擎使用一种倒排索引——不是针对每个单一的单词，为每个单一的网页及其上面的所有单词都编排一个目录，而是为每个单词出现的位置编排一个目录。
Most search engines use an inverted index — rather than compiling a list of every single Web page and all its words, for every single word, they compile a list of the places where it appears.
域名长度，短和可爱的域名是最好的。单一得、可识别的词优于多个单词。
Short and sweet is generally best. Single, recognizable words are considered better than multiple words.
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