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Atoms must start with a lower case character, or you can delimit with single quotes.
原子值必须以小写字母开头，否则需要加上单引号。
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In printing, a lower case character.
印刷或打印用的一种小写字符。
The character which when preceded by an escape character represents any non-lower case character.
前跟转义字符用于表示任意非小写字母的字符。
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