DecimalFor matSymbols对象包含了诸如合适的小数分隔符、分组分隔符及负号标记在内的信息。
The DecimalFormatSymbols object contains information such as the appropriate decimal and grouping separators and minus sign symbol.
对于该新功能，需要在消息描述符中附加字段来保留分段和分组信息。
For this new function, additional fields in message descriptor were needed to keep information for the segmenting and grouping.
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