The character class name for printable characters.
表示可打印字符的字符分类名称。
Listing 9 USES Quoted-Printable encoding that corresponds to printable characters according to the ASCII character set.
清单9使用Quoted - Printable编码，这种编码符合依照ASCII字符集的可打印字符。
The data is entirely binary and unprintable, so it has been printed out with the non-printable characters in hexadecimal format.
因为该数据完全是二进制且不可输出，所以已经以十六进制格式的非输出字符输出了。
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