... naive user 新手使用者 nak character 否定字符 NAK Negative AcKnowledge character 否认符，否认信号，不予确认字符 ...
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negative acknowledge character 否定符号; 否定回答; 否定认可字符; 否定信号; 否定字符; 否认记号; 否认字符 regative acknowledge character 否认字元 .
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决定是否回显字符 ATE
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exists函数确定是否定义了一个具有由字符串定义的名称的变量(在本例中为全局变量g： syntax_on)。
The exists function determines whether a variable with the name specified by the string (in this case, the global variable g: syntax_on) has been defined.
前向否定界定符。与肯定界定符相反；当所含表达式不能在字符串当前位置匹配时成功。
Negative lookahead assertion. This is the opposite of the positive assertion; it succeeds if the contained expression doesn't match at the current position in the string.
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