[1] Stringsdict File Format ( 版) <https://developer.apple.com/library/ios/documentation/MacOSX/Conceptual/BPInternational/StringsdictFileFormat/StringsdictFileFormat.html>
A .stringsdict file is a property list used to define language plural rules.
[2] Localizing with Plurals and Genders | [objective toast] ( 版) <http://objectivetoast.com/2014/04/21/localizing-with-plurals-and-genders/>
[3] Pluralization on iOS and OS X ( 版) <http://pulkitgoyal.in/pluralization-on-ios/>