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.

youdao

我已去掉了创建文档的归属权，你可以打印，所以你可以容易地填空格。

I've taken the liberty of creating a document you can print so you can easily fill in the blanks.

youdao

这使 print 语句打印字符值时后面跟着空格字符，而不是换行字符。

This makes the print statement print out the character value, followed by a space character instead of a newline character.

youdao

That is, there would be a printed form on paper with spaces to fill in the numbers or other things.

也就是说，开始在纸上打印表格,上面留有空格需要填写数字或是其他信息。

耶鲁公开课 - 金融市场课程节选

The compiler is going to ignore all of this so-called "pretty printing" -- all of this sort of indentation, -- all of this white space -- that's really for the human's benefits, both yours, your colleagues, the teaching staff, and the like.

编译器会忽略所有的叫做,“优美打印“--所有的这类缩进，所有的这些空格-,只是为了我们的利益，也是你的，你的同事，教员的和其他人的利益。

哈佛公开课 - 计算机科学课程节选