该阶段完成：字符映射（character mapping）、三字符处理（trigraph processing）、行拼接（line splicing）、字符串分解（tokenizing）等任务。
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terminal character mapping 终端字符映像
Character UV Mapping 角色UV贴图
character mapping function 字符序列映射函数
Character-set Mapping 字符集映射
mapping character 特征映射
solid character point mapping method 实物标志点映射法
The book does not distinguish well between Unicode as a character mapping and the UTF-8 encoding.
需要注意的是，在本书中 Unicode、字符映射表和 UTF-8 编码这三个概念没有细加区分。
For English and the vast majority of European languages, the one-key (or two) to one-character mapping is sufficient.
对于英语和很多欧洲语言来说，一个字符映射为一个键(或两个键)就足够了。
If character mapping is used, then first consider whether you want to apply normalization to the character being mapped, or apply normalization after the character is mapped.
如果使用字符映射，则首先考虑是否对映射字符进行规范化，还是对映射后的字符规范化。
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