The length field for this volume record cannot be read.
无法读取这个卷记录的长度字段。
For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.
对于每个非空的变长字段，记录头使用一或两个字节包含了列的长度。
The field contains the length of the record to which it is attached.
该字段含有其所属记录的长度。
The field contains the length of the record to which it is attached.
该字段含有其所属记录的长度。
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