值可能需要匹配一种特定格式，如邮政编码。
A value may need to match a specific format, such as a postal delivery code.
为了获得较高的性能，采用二进制编码格式。
In order to get high performance, we use binary encoding format.
另一个主要因素是文件是否以ucs - 2格式编码。
Another major factor is whether the original file is stored as UCS-2.
另一个主要因素是文件是否以ucs - 2格式编码。
Another major factor is whether the original file is stored as UCS-2.
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