在isam的操作手册中有这几句，是讲DECIMALTYPE数据类型的，不明白如何翻译：
File-Storage Struct
First Byte
The top 1 bit is the sign of the number.
The low 7 bits are the exponent in excess of 64.
Remaining Bytes
The remaining bytes are the base 100 digits(in 100 complement format for negative numbers)
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是什么东西啊？
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看不懂