如果你观察打印输出的图像，你会看到这个字母和数字的排列：6equj5。
If you look at this printout, you will see this sequence of letters and Numbers: 6equj5.
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.
日期代码：由一个或多个字母数字组成，打印在内圈或外圈上，用以表示它们的生产年月。
DATE CODE: one or more letters and Numbers stamped on cups and cones to indicate the month and year they were produced.
日期代码：由一个或多个字母数字组成，打印在内圈或外圈上，用以表示它们的生产年月。
DATE CODE: one or more letters and Numbers stamped on cups and cones to indicate the month and year they were produced.
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