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解析器不关心空白或注释，因而扫描程序会忽略了这些。
The parser doesn't care about whitespace or comments, so the scanner disregards them.
请注意，我们只能使用那些在扫描程序阶段为“原语”的名称。
The trick is that we can only use those names that are "primitive" at the scanner stage.
为您的场景选择合适的扫描程序对于获得更好的性能非常重要。
It's important to choose the appropriate scanner for your scenario to obtain better performance.
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