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这段代码接受来自用户的受感染数据，检查要打印的字符只有字母和数字字符以及空格符，以此来提供安全保护。
This piece of code takes up tainted data from the user, ensuring protection as it checks that the characters to be printed are only alphanumeric characters and Spaces.
要使用开源系统开发实用的注释系统，对只有字母和数字组成的文本进行后处理以获得更有条理的数据，这种方法更加简便。
Post-processing the text of only letters and numbers for higher-order data is a much easier method of developing a useful annotation system with available open source systems.
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