标准异常名是内置的标识(没有保留关键字)。
Standard exception names are built-in identifiers (not reserved keywords).
增加数据包校验位，保证数据传输的一致性；通过正向替换和逆向替换消除并恢复数据中存在的保留关键字；
The data packet increased checking parity can ensure data consistency in transmission, to remove and recover a reserved keyword of data though the positive replacement and reverse replacement.
还要保留名称、导演和关键字以表示用于用户搜索的特定字段。
Also reserve title, director, and keyword to represent specific fields for the user to search.
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