方块白文的书写符号系统与汉字俗字有很密切的关系。
There are very close relations between the writing symbol system of the old Bai scrip and Chinese Variant characters.
文字是记录语言的书写符号系统，是辅助与扩大语言交际作用的最重要的工具。
Characters are the writing symbol system of recording the language and the most important tool which assists and expands the communication function of language.
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