To understand what these pieces mean, consider an optical character recognition system that scans glyphs printed on paper and converts them into three-digit decimal Numbers.

要理解这些部分的具体含义，请考虑一个光学字符识别系统，该系统扫描纸张上的符号并将它们转换为3位的十进制数。

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Gets the decimal digit value of the numeric character at the specified index of the specified string.

获取位于指定字符串的指定索引位置的数值型字符的十进制数字值。

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A word character is any letter, decimal digit, or punctuation connector such as an underscore.

任何字母、十进制的数字或标点符号连接器如下划线的单词字符。

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