Actually, for this particular script, an alternative fix is to remove the return keyword from the line.

实际上，对于这段脚本，另外一种解决办法是删除return关键字。

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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.

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；

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