As described in clause 16, in certain circumstances during translation phase 4, white space (or the absence thereof) serves as more than preprocessing token separation.

如在第16 章中所说，在第4 阶段的某些情况下，空白（也可能没有）可能不仅分隔预处理标记。

youdao

White space can appear within a preprocessing token only as a part of a header name or between the quotation characters in a character literal or string literal.

仅当作为头名称的一部分，或在字符文字量或字符串文字量的引号字符之间时，空白才可以出现在预处理标记内部。

youdao

A preprocessing token is the minimal lexical element of the language in translation phases 3 through 6.

预处理标记是语言从第3到第6阶段中最小的词法元素。

youdao