对于包含ASCII以外的Unicode字符的文档，解析器必须为每个字符读取和转换多字节序列。
For documents that contain Unicode characters beyond the ASCII range, the parser must read and convert multiple byte sequences for each character.
Unicode转换格式(Unicode Transformation Formats, UTFs)是一种通过映射多字节编码中的值来支持Unicode的字符编码方案。
Unicode Transformation Formats (UTFs) are CESs that support the use of Unicode by mapping a value in a multi-byte code.
语言环境设置会导致printf中的% l s格式说明符调用wcsrtombs函数以便于将宽字符的参数字符串转换成依赖语言环境的多字节编码。
The locale setting will cause the % ls format specifier in printf to call the wcsrtombs function in order to convert the wide character argument string into the locale-dependent multi-byte encoding.
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