您不能直接在内容中输入特殊字符。
You cannot typed special characters directly into your content.
大写键可以直接打印，键盘驱动程序可以对很多更为特殊的情况进行编码，但是其模型是相同的：按下一个键就代表输入某个特定的字符。
The key caps may be printed differently, and the keyboard driver may encode a few more special cases, but the model is the same: Press a key to type a specific character.
只要您允许用户输入自由文本，您就必须确保该文本不会包含会造成破坏的特殊字符。
Whenever you allow a user to type in free text, you must ensure that the text doesn't contain special characters that could cause harm.
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