The reason underscores are used here with Pascal Case notation is so that the table name and field name are clearly separated.
在没有下划线情况下，很难区分表名和字段名的分界点。
The lexers for case-insensitive languages like Pascal and VHDL are slightly more complicated because they must parse, for example, begin and begin and generate the same token for the parser.
Pascal和VHDL等大小写敏感语言中的lexer要复杂一些，因为它们必须解析begin和begin等内容并为解析器生成相同的标记。
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