Spreadsheet Features电子表格功能
Even for basic features like date storage, the official Excel formats store the same content in different ways. The parsers are expected to convert from the underlying file format representation to the Common Spreadsheet Format. Writers are expected to serialize SheetJS workbooks in the underlying file format.即使对于日期存储等基本功能，官方Excel格式也以不同的方式存储相同的内容。解析器预计将从底层文件格式表示转换为通用电子表格格式。编写器应以底层文件格式序列化SheetJS工作簿。
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