请注意，反映每个日志文件的大小主要是预先分配的空间，一些日志头控制字符除外。
Note that the size reflected for each log file is mostly pre-allocated space except for some log header control characters.
相似的，像ISBN、OCLC控制号、LCCN以及图书馆条码号这些“识别符”都是重要的字符串，它们都是识别的指示符，但是作用的大小各有不同。
Similarly, "identifiers" such as ISBN, OCLC number, LCCN, and library barcode number are used as key strings but are only identity indicators with varying strengths.
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