控制加密转换操作的符号序列。
It is the symbol sequence controlling the operation of encryption transformation.
控制字，控制符号，以及大括号控制信息。
A control symbol consists of a backslash followed by a single, nonalphabetic character.
控制字，控制符号，以及大括号控制信息。
A control symbol consists of a backslash followed by a single, nonalphabetic character.
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