Names must begin with an alphabetic character, not a number or symbol.
名称只能以英文字母开始，不能是数字或符号。
A control symbol consists of a backslash followed by a single, non alphabetic character.
一个控制符号由一个反斜杠以及紧跟着它的一个简单的非字母的字符。
A control symbol consists of a backslash followed by a single, non alphabetic character.
一个控制符号由一个反斜杠以及紧跟着它的一个简单的非字母的字符。
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