Word is the common factor underlying a set of forms, a unit of vocabulary, a lexical item, or a lexeme.
词是在一组形式之下的共同要素，是词汇的单位，是一个词条，或是一个词位。
A lexeme is a string, just like a token, but it has been normalized so that different forms of the same word are made alike.
语意是一个字串，和记号很像，但是它已经是一般化了的，这样同一个词的不同形式就可以一样来处理。
This point in the source file is usually marked by a lexeme that is not consumed as a token by the preprocessor, meaning one that is not a preprocessor directive.
源文件中的这个点通常由一个词素进行标记，而预处理程序不会使用该词素作为一个语言符号，这表示它并不是一项预处理程序指令。
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