For example, a U.S. ZIP code is five digits plus an optional "plus 4" qualifier composed of a hyphen and four additional digits.
例如，美国的邮政编码是五位数字加上可选的“4个”限定号码，后者由连字符和四位附加数字组成。
It contains the locale folders, which are lower cased, and a hyphen separates the language code from the optional country code.
它包含locale文件夹，使用小写格式，并用连字符分隔语言代码和可选的国家代码。
It contains the locale folders, which are lower cased, and a hyphen separates the language code from the optional country code.
它包含locale文件夹，使用小写格式，并用连字符分隔语言代码和可选的国家代码。
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