A locale name is constructed from a two-letter lowercase ISO country code, optionally followed by an underscore or hyphen and a two-letter uppercase ISO language code.
语言环境名称是这样组成的：小写的两字母iso语言代码，可选地，后面可以跟下划线或连字符以及大写的两字母iso国家或地区代码。
The hyphen (-) used to separate words in the W3C CSS Version 2.0 specification isn't used as part of the code convention in the Flex implementation.
在W3C CSS版本2.0中被用来分离单词的连字符(-)并未用作Flex实现内的代码约定的一部分。
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