You can use resource suffixes to specify alternate versions of any resources,
not just the layout. For example, you can use them to provide localized text strings in different languages.
Each alternate resource file must define exactly the same set of IDs.
Android supports suffixes for the current language, region, pixel density,
screen size, resolution, input method, and more. See the Android resources documentation for
an up-to-date list of suffixes and inheritance rules.
http://d.android.com/guide/topics/resources/resources-i18n.html#AlternateResources
Android 支持多種前綴
From Hello-Android Page 54